"I think we would have been pretty good friends but, alas, we have been on opposite sides. So, I'm not on his Christmas card list." - Jim Harbaugh
"I'm surprised he would say that, because he sends me a birthday card every year." - Pete Carroll
Yeah, it's a unique and complicated relationship, one built on equal parts playful contempt and compulsive competition.
With a dash of respect.
One that gained steam in school with the biggest upset in college football history, way back in 2007, continued two years later with the query heard 'round the football world – "What's your deal?" – and reached its apex in the 2013 NFC title game.
Ready or not, the reboot drops Monday night at Allegiant Stadium.
That's when Carroll, in the Silver and Black corner, with navy, action green and wolf grey trunks with cardinal and gold accents, plays host to Harbaugh, coming out of the powder blue, white and gold corner, with scarlet and gold trunks and cardinal red and white accents.
Raiders vs. Chargers? No doubt. But also, Carroll vs. Harbaugh, Round 7, toting every piece of baggage from their previous coaching stops. And yes, in head-to-head games as coaches, the two are (checks notes) an even 6-6.
What's your deal, indeed.

"I always think that had I ever played for him, on one of his teams, because he was coaching when I was playing, or was on his staff, once I got into coaching, I bet we would have been, like, really good friends," Harbaugh said earlier this week. "I learned a lot from him, just watching him, but he's just always been on the other side.
"When I was a player, he was a defensive coordinator or head coach somewhere. And then when I was coaching, we were just trying to gouge each other's eyes out…in the competitive spirit of that."
Harbaugh's Cheshire cat grin said more. Much more.
A history lesson, then.
In the late 1980s and early 1990s, Harbaugh, as a quarterback for the Bears and Colts, seven times went up against Carroll, who, in that time frame, worked as a defensive backs coach for the Vikings and was later the Jets defensive coordinator and head coach before becoming the Patriots coach. Harbaugh started four of those games and Carroll's teams won three of them. In fact, Carroll the head coach was 3-0 against Harbaugh the quarterback.
Flash forward to the Los Angeles Memorial Coliseum on Oct. 6, 2007.
USC, which had won consecutive national championships in 2003 and 2004 and was a first down away from a three-peat under Carroll while birthing a trio of Heisman winners in Carson Palmer, Matt Leinart and Reggie Bush, was a 41-point favorite over Stanford.
Harbaugh, who had just been hired at Stanford when he stirred the pot by saying he heard Carroll would only be with the Trojans for one more year, led the Cardinal to a last-minute 24-23 victory over No. 2-ranked USC to end its 35-game home winning streak.
Two years later, and on the same field, Harbaugh's Cardinal waxed Carroll's Trojans, 55-21, leading to the tense exchange at midfield.
"How are you feeling?" the usually unflappable Carroll asked. "Are you all right?"
The ultra-intense Harbaugh, who had just mocked the Trojans for "running in" off the field before the clock struck zero, seemed confused.
"Yeah, I'm great," Harbaugh answered. "What's your deal?"
It was a viral moment before viral moments were described as such, a meme before memes were known.
Carroll was in the NFL with the Seahawks the next year, and Harbaugh followed him to the NFC West with the 49ers, yup, one year later.
Twice a year they faced off from 2011-2014, the two splitting eight regular season meetings. But Carroll's Seahawks won the big one, that epic NFC title game, en route to a Super Bowl XLVIII victory.

With Harbaugh returning to college in 2015 with Michigan – the Wolverines won a natty in 2023 – and returning to the NFL last season with the Chargers, this is the first time he will be on an opposite sideline from Carroll since 2014.
Rivalry much?
"I have no fond memories, so I'm not going to go there," Carroll said with a twinkle in his eye. "They've been great games, that's all. There's been a bunch of them."
When told Harbaugh said they could have been really great friends had they ever shared a sideline, Carroll couldn't, or wouldn't resist.
"He's seen my game, and so he would like me to help him win, if I could," Carroll said. "So, he'd like us to play together, I guess.
"But one thing we would certainly see eye to eye on is about competing. He's always been a great competitor. He battled through so much in his playing days and in his coaching days as well. So, I appreciate him saying that because I'd like to play with him, too."
Maybe a Monday night game of catch at midfield?
After all, it's Carroll's 74th birthday, and depending upon whom you believe, Harbaugh owes him a birthday card.
Take a look inside Intermountain Health Performance Center to view the best photos from Thursday's practice as the Raiders prepare for their Week 2 matchup against the Los Angeles Chargers.

A Las Vegas Raiders pad on the field during practice at Intermountain Health Performance Center.

Las Vegas Raiders defensive end Maxx Crosby (98) in the weight room during practice at Intermountain Health Performance Center.

Las Vegas Raiders linebacker Cody Lindenberg (55) in the weight room during practice at Intermountain Health Performance Center.

A Las Vegas Raiders' helmet and pads in the weight room during practice at Intermountain Health Performance Center.

Las Vegas Raiders cornerback Eric Stokes (22) walks out to the field for practice at Intermountain Health Performance Center.

Las Vegas Raiders defensive tackle JJ Pegues (92) in the weight room during practice at Intermountain Health Performance Center.

Las Vegas Raiders defensive end Maxx Crosby (98) in the weight room walks out to the field for practice at Intermountain Health Performance Center.

Las Vegas Raiders cornerback Darnay Holmes (30) during practice at Intermountain Health Performance Center.

Las Vegas Raiders cornerback Eric Stokes (22) during practice at Intermountain Health Performance Center.

Las Vegas Raiders defensive tackle Jonah Laulu (96) walks out to the field for practice at Intermountain Health Performance Center.

Las Vegas Raiders center Jackson Powers-Johnson (58) in the weight room during practice at Intermountain Health Performance Center.

Las Vegas Raiders tackle Kolton Miller (74) in the weight room during practice at Intermountain Health Performance Center.

Las Vegas Raiders tight end Michael Mayer (87) in the weight room during practice at Intermountain Health Performance Center.

Las Vegas Raiders cornerback Greedy Vance (41) in the weight room during practice at Intermountain Health Performance Center.

Las Vegas Raiders defensive tackle JJ Pegues (92) in the weight room during practice at Intermountain Health Performance Center.

Las Vegas Raiders linebacker Brian Asamoah II (53) during practice at Intermountain Health Performance Center.

Las Vegas Raiders wide receiver Justin Shorter (88) during practice at Intermountain Health Performance Center.

Las Vegas Raiders offensive lineman Stone Forsythe (70) walks out to the field for practice at Intermountain Health Performance Center.

Las Vegas Raiders quarterback Jeff Driskel (17) walks out to the field for practice at Intermountain Health Performance Center.

Las Vegas Raiders cornerback Darnay Holmes (30) during practice at Intermountain Health Performance Center.

Las Vegas Raiders wide receiver Justin Shorter (88) during practice at Intermountain Health Performance Center.

Las Vegas Raiders cornerback Greedy Vance (41) walks out to the field for practice at Intermountain Health Performance Center.

Las Vegas Raiders quarterback Kenny Pickett (15) walks out to the field for practice at Intermountain Health Performance Center.

Las Vegas Raiders center Jackson Powers-Johnson (58) walks out to the field for practice at Intermountain Health Performance Center.

Las Vegas Raiders center/guard Jordan Meredith (61) walks out to the field for practice at Intermountain Health Performance Center.

A Las Vegas Raiders' helmet on the field during practice at Intermountain Health Performance Center.

Las Vegas Raiders center Will Putnam (67) walks out to the field for practice at Intermountain Health Performance Center.

Las Vegas Raiders cornerback Greedy Vance (41) during practice at Intermountain Health Performance Center.

Las Vegas Raiders run game coordinator/offensive line coach Brennan Carroll and center Jackson Powers-Johnson (58) during practice at Intermountain Health Performance Center.

Las Vegas Raiders guard Caleb Rogers (76) walks out to the field for practice at Intermountain Health Performance Center.

Las Vegas Raiders wide receiver Tre Tucker (1) in the weight room walks out to the field for practice at Intermountain Health Performance Center.

Las Vegas Raiders guard Alex Cappa (65) walks out to the field for practice at Intermountain Health Performance Center.

Las Vegas Raiders cornerback Darien Porter (26) walks out to the field for practice at Intermountain Health Performance Center.

Las Vegas Raiders wide receiver Dont'e Thornton Jr. (10) walks out to the field for practice at Intermountain Health Performance Center.

Las Vegas Raiders safety Lonnie Johnson Jr. (32) walks out to the field for practice at Intermountain Health Performance Center.

Las Vegas Raiders defensive tackle Tonka Hemingway (97) walks out to the field for practice at Intermountain Health Performance Center.

Las Vegas Raiders defensive tackle JJ Pegues (92) walks out to the field for practice at Intermountain Health Performance Center.

Las Vegas Raiders tight end Michael Mayer (87) walks out to the field for practice at Intermountain Health Performance Center.

Las Vegas Raiders guard Atonio Mafi (56) walks out to the field for practice at Intermountain Health Performance Center.

Las Vegas Raiders safety Jeremy Chinn (11) walks out to the field for practice at Intermountain Health Performance Center.

Las Vegas Raiders defensive tackle Leki Fotu (95) walks out to the field for practice at Intermountain Health Performance Center.

Las Vegas Raiders tackle Charles Grant (60) during practice at Intermountain Health Performance Center.

Las Vegas Raiders running back Zamir White (3) during practice at Intermountain Health Performance Center.

Las Vegas Raiders running back Raheem Mostert (31) during practice at Intermountain Health Performance Center.

Las Vegas Raiders running back Ashton Jeanty (2) during practice at Intermountain Health Performance Center.

Las Vegas Raiders wide receiver Dont'e Thornton Jr. (10) during practice at Intermountain Health Performance Center.

Las Vegas Raiders running backs coach Deland McCullough and linebackers coach John Glenn during practice at Intermountain Health Performance Center.

Las Vegas Raiders quarterback Geno Smith (7) during practice at Intermountain Health Performance Center.

Las Vegas Raiders linebacker Germaine Pratt (57) during practice at Intermountain Health Performance Center.

Las Vegas Raiders quarterback Geno Smith (7) during practice at Intermountain Health Performance Center.

Las Vegas Raiders running back Raheem Mostert (31) during practice at Intermountain Health Performance Center.

Las Vegas Raiders linebacker Brennan Jackson (54) during practice at Intermountain Health Performance Center.

Las Vegas Raiders safety Terrell Edmunds (28) during practice at Intermountain Health Performance Center.

Las Vegas Raiders cornerback Kyu Blu Kelly (36) during practice at Intermountain Health Performance Center.

Las Vegas Raiders Head Coach Pete Carroll during practice at Intermountain Health Performance Center.

Las Vegas Raiders offensive lineman Laki Tasi (79) during practice at Intermountain Health Performance Center.

Las Vegas Raiders tight end Michael Mayer (87) during practice at Intermountain Health Performance Center.

Las Vegas Raiders quarterback Geno Smith (7) during practice at Intermountain Health Performance Center.

Las Vegas Raiders quarterback Geno Smith (7) during practice at Intermountain Health Performance Center.

Las Vegas Raiders quarterback Kenny Pickett (15) during practice at Intermountain Health Performance Center.

Las Vegas Raiders guard Caleb Rogers (76) during practice at Intermountain Health Performance Center.

Las Vegas Raiders wide receiver Jack Bech (18) during practice at Intermountain Health Performance Center.

Las Vegas Raiders wide receiver Dont'e Thornton Jr. (10) during practice at Intermountain Health Performance Center.

Las Vegas Raiders defensive end Tyree Wilson (9) during practice at Intermountain Health Performance Center.

Las Vegas Raiders defensive tackle JJ Pegues (92) during practice at Intermountain Health Performance Center.

Las Vegas Raiders defensive tackle Adam Butler (69) during practice at Intermountain Health Performance Center.

Las Vegas Raiders quarterback Geno Smith (7) during practice at Intermountain Health Performance Center.

Las Vegas Raiders linebacker Devin White (45) during practice at Intermountain Health Performance Center.

Las Vegas Raiders wide receiver Justin Shorter (88) during practice at Intermountain Health Performance Center.

Las Vegas Raiders defensive tackle Adam Butler (69) during practice at Intermountain Health Performance Center.

Las Vegas Raiders defensive tackle Tonka Hemingway (97) during practice at Intermountain Health Performance Center.

Las Vegas Raiders defensive tackle Tonka Hemingway (97) during practice at Intermountain Health Performance Center.

Las Vegas Raiders defensive end Maxx Crosby (98) during practice at Intermountain Health Performance Center.

Las Vegas Raiders defensive end Maxx Crosby (98) during practice at Intermountain Health Performance Center.

Las Vegas Raiders defensive end Tyree Wilson (9) during practice at Intermountain Health Performance Center.

Las Vegas Raiders defensive end Tyree Wilson (9) during practice at Intermountain Health Performance Center.

Las Vegas Raiders defensive tackle JJ Pegues (92) during practice at Intermountain Health Performance Center.

Las Vegas Raiders defensive tackle Leki Fotu (95) during practice at Intermountain Health Performance Center.

Las Vegas Raiders quarterback Kenny Pickett (15) during practice at Intermountain Health Performance Center.

Las Vegas Raiders quarterback Jeff Driskel (17) during practice at Intermountain Health Performance Center.

Las Vegas Raiders quarterback Cam Miller (5) during practice at Intermountain Health Performance Center.

Las Vegas Raiders guard Caleb Rogers (76) during practice at Intermountain Health Performance Center.

Las Vegas Raiders wide receiver Dont'e Thornton Jr. (10) during practice at Intermountain Health Performance Center.

Las Vegas Raiders wide receiver Phillip Dorsett II (13) during practice at Intermountain Health Performance Center.

Las Vegas Raiders wide receiver Shedrick Jackson (4) during practice at Intermountain Health Performance Center.

Las Vegas Raiders wide receiver Justin Shorter (88) during practice at Intermountain Health Performance Center.

Las Vegas Raiders wide receiver Jakobi Meyers (16) during practice at Intermountain Health Performance Center.

Las Vegas Raiders wide receiver Alex Bachman (81) during practice at Intermountain Health Performance Center.

Las Vegas Raiders wide receiver Dont'e Thornton Jr. (10) during practice at Intermountain Health Performance Center.

Las Vegas Raiders wide receiver Jack Bech (18) during practice at Intermountain Health Performance Center.

Las Vegas Raiders wide receiver Jakobi Meyers (16) during practice at Intermountain Health Performance Center.

Las Vegas Raiders wide receiver Dont'e Thornton Jr. (10) during practice at Intermountain Health Performance Center.

Las Vegas Raiders wide receiver Phillip Dorsett II (13) during practice at Intermountain Health Performance Center.

Las Vegas Raiders running back Ashton Jeanty (2) during practice at Intermountain Health Performance Center.

Las Vegas Raiders running back Raheem Mostert (31) during practice at Intermountain Health Performance Center.

Las Vegas Raiders running back Dylan Laube (23) during practice at Intermountain Health Performance Center.

Las Vegas Raiders running back Chris Collier (35) during practice at Intermountain Health Performance Center.

Las Vegas Raiders running back Ashton Jeanty (2) and running backs coach Deland McCullough during practice at Intermountain Health Performance Center.

Las Vegas Raiders running back Ashton Jeanty (2) during practice at Intermountain Health Performance Center.

Las Vegas Raiders running back Raheem Mostert (31) during practice at Intermountain Health Performance Center.

Las Vegas Raiders wide receiver Justin Shorter (88) during practice at Intermountain Health Performance Center.

Las Vegas Raiders wide receiver Justin Shorter (88) during practice at Intermountain Health Performance Center.

Las Vegas Raiders tight end Albert Okwuegbunam (86) during practice at Intermountain Health Performance Center.

Las Vegas Raiders running back Ashton Jeanty (2) during practice at Intermountain Health Performance Center.

Las Vegas Raiders wide receiver Dont'e Thornton Jr. (10) during practice at Intermountain Health Performance Center.

Las Vegas Raiders tight end Carter Runyon (46) during practice at Intermountain Health Performance Center.

Las Vegas Raiders wide receiver Jack Bech (18) during practice at Intermountain Health Performance Center.

Las Vegas Raiders wide receiver Dont'e Thornton Jr. (10) and cornerback Decamerion Richardson (25) during practice at Intermountain Health Performance Center.

Las Vegas Raiders wide receiver Dont'e Thornton Jr. (10) and cornerback Decamerion Richardson (25) during practice at Intermountain Health Performance Center.

Las Vegas Raiders wide receiver Alex Bachman (81) during practice at Intermountain Health Performance Center.

Las Vegas Raiders cornerback Kyu Blu Kelly (36) and wide receiver Shedrick Jackson (4) during practice at Intermountain Health Performance Center.

Las Vegas Raiders wide receiver Phillip Dorsett II (13) during practice at Intermountain Health Performance Center.

Las Vegas Raiders wide receiver Jakobi Meyers (16) during practice at Intermountain Health Performance Center.

Las Vegas Raiders wide receiver Justin Shorter (88) during practice at Intermountain Health Performance Center.

Las Vegas Raiders defensive tackle Treven Ma'ae (68) during practice at Intermountain Health Performance Center.

Las Vegas Raiders defensive end Maxx Crosby (98) during practice at Intermountain Health Performance Center.

Las Vegas Raiders defensive tackle Adam Butler (69) during practice at Intermountain Health Performance Center.

Las Vegas Raiders defensive tackle Jonah Laulu (96) during practice at Intermountain Health Performance Center.

Las Vegas Raiders defensive end Jahfari Harvey (91) during practice at Intermountain Health Performance Center.

Las Vegas Raiders defensive tackle Leki Fotu (95) during practice at Intermountain Health Performance Center.

Las Vegas Raiders linebacker Devin White (45) during practice at Intermountain Health Performance Center.

Las Vegas Raiders linebacker Germaine Pratt (57) during practice at Intermountain Health Performance Center.

Las Vegas Raiders linebacker Tommy Eichenberg (44) during practice at Intermountain Health Performance Center.

Las Vegas Raiders linebacker Cody Lindenberg (55) during practice at Intermountain Health Performance Center.

Las Vegas Raiders cornerback Kyu Blu Kelly (36) during practice at Intermountain Health Performance Center.

Las Vegas Raiders linebacker Brian Asamoah II (53) during practice at Intermountain Health Performance Center.

Las Vegas Raiders linebacker Tommy Eichenberg (44) during practice at Intermountain Health Performance Center.

Las Vegas Raiders linebacker Devin White (45) during practice at Intermountain Health Performance Center.

Las Vegas Raiders linebacker Germaine Pratt (57) during practice at Intermountain Health Performance Center.

Las Vegas Raiders defensive end Maxx Crosby (98) during practice at Intermountain Health Performance Center.

Las Vegas Raiders defensive end Maxx Crosby (98) during practice at Intermountain Health Performance Center.

Las Vegas Raiders safety Jeremy Chinn (11) during practice at Intermountain Health Performance Center.

Las Vegas Raiders General Manager John Spytek during practice at Intermountain Health Performance Center.

Las Vegas Raiders linebacker Jamal Adams (33) during practice at Intermountain Health Performance Center.

Las Vegas Raiders cornerback Eric Stokes (22) during practice at Intermountain Health Performance Center.

Las Vegas Raiders wide receiver Tre Tucker (1) during practice at Intermountain Health Performance Center.

Las Vegas Raiders wide receiver Jakobi Meyers (16) during practice at Intermountain Health Performance Center.

Las Vegas Raiders tackle Kolton Miller (74) during practice at Intermountain Health Performance Center.

Las Vegas Raiders cornerback Darnay Holmes (30) during practice at Intermountain Health Performance Center.