In Angel (1984), Mae and Solly act like they hate each other and constantly insult one another. However. they also spend all of their free time together playing cribbage, and when she discovers Mae after she is fatally stabbed, Solly is absolutely heartbroken.
Roger East and José Ramos-Horta in Balibo, who semi-jokingly bicker almost constantly and even provoke each other into a fight at one point.
Bean: Bean with David Langley. David constantly bickers with Bean because of the latter's bizarre antics, but they eventually become good friends. Bean describes David as his "best friend" in his big speech, and David admits to his wife Allison that despite everything that's happened, he's grown fond of Bean. Bean even gives him a Bear Hug before going back to England.
David: I don't know what to say about Bean. He is clearly a force ten disaster area... but God help me... I like him.
The Boys in the Band. Michael and Harold. While it isn't clear they are best friends, two moments reveal their deep relationship: Michael's gift to Harold, and Harold's quiet assurance (after giving him a "The Reason You Suck" Speech) that "I'll call you tomorrow."
Dante and Randall from Clerks. They both argue about things all the time and snark at each other (especially Randall, who seems to enjoy messing with Dante), but when it's all said and done, the two are almost inseparable buddies. Jay and Silent Bob have a similar dynamic, except Jay does most of the talking and Silent Bob ignores it with an air of sarcasm, despite not saying anything.
Dating Amber: Amber and Eddie. The two's friendship is started by Amber throwing a rock at Eddie's bike and knocking him off of it. After that, she dope slaps him once, and both of them insult each other. Despite this, it's clear both are best friends. Amber even gives Eddie all the money she had saved at the end.
Bartleby and Loki in Dogma (like Jay and Silent Bob, with whom they share the screen) are unquestionably vitriolic.
Loki: All lines... are currently down. Bartleby: Okay, I'm gonna have to— Loki: Would you just knock it off! Bartleby: Hey, you're doing it again, now stop— Loki: Fuck! Bartleby: —what did we talk about?
Michael Patrick Donovan and Thomas Aloysius Gilhoolie from Donovan's Reef: World War II buddies who share the same birthday and make sure they get together every year to punch the crap out of each other.
Sam French and Jake Wyer in Fifty Fifty (1992) have this in spades, although Jake likes to pretend he can't stand Sam.
Ford V Ferrari: Carroll Shelby and Ken Miles seem to have this relationship. This is best shown when they "fight" after Miles is fired; while they're both angry at each other, they're not trying to hurt each other, and quickly patch things up over two bottles of Coca-Cola.
Ken: (motions his bottle to Shelby) Up yours. Shelby: (responds in kind and toasts Miles) Oh, go to hell.
Forrest Gump doesn't see it, but Lt. Dan has a lot of anger towards him and generally treats him with contempt. But underneath it is an appreciation that Forrest holds no grudges and will do anything to help a person in need. By the end, there is no doubt they are best friends.
Full Metal Jacket: Animal Mother and 8-Ball spend their time throwing obscenely racist slurs at each other, but when 8-Ball gets shot by a sniper, Animal Mother refuses to leave him behind and is eventually killed in a rescue attempt.
The Getting of Wisdom: As the film progresses, the other girls mellow out a bit and their interactions with the protagonist Laura become somewhat strained, although they still give her a lot of heat for her working-class background.
Good Will Hunting: Will and his friends can't go one single scene without insulting each other, but it's made clear that they'd all lie on the traffic for him and he appreciates their loyalty.
Gran Torino has Walt and his friend the barber, with whom he cheerfully trades racial slurs and hair-raising insults. Walt's relationship with Sue also has shades of this; Sue refuses to take Walt's racist crap and doesn't hesitate to call him out on his bullshit, which earns her Walts genuine, albeit somewhat grudging, respect.
This Trope could describe the relationship between pretty much any two members of the team (except Groot, who's friendly to everyone), but especially between to Drax and Gamora. In one scene, the former calls the latter a whore and then a few minutes later shoots Nebula with a rocket launcher when she is talking trash to Gamora and planning to attack her.
Drax: No one talks to my friends like that.
Made explicit in Volume 3 between Rocket and Quill, who spent most of Vol 2 and Infinity War arguing and feuding but when Rocket is hurt, Quill is devastated and describes Rocket as his best friend repeatedly.
The Journey of Natty Gann: Natty and her friend Louie get Into a fist fight over the their respective fathers opinions. However, when Natty sees his family being evicted, she's devastated, calling out words of support and joining the crowd throwing rocks at the officers evicting the family.
Kaamelott: Premier Volet: Perceval and Karadoc's friendship from the series seems to have soured into this, with Perceval now actively insulting Karadoc's intelligence (and making rather good points, too) rather than both thinking they're the smartest in the room.
Kiss Kiss Bang Bang has Harry and Perry. Harry is sure that Perry is really his friend, and somehow ends up being right. Harry would give as good as he gets, except he's a colossal ditz and no one can out-insult Gay Perry anyway.
Legolas and Gimli are portrayed in this manner. Basically Legolas is Bugs Bunny and Gimli is Daffy Duck. As much as Gimli is exasperated by Legolas and as often as Legolas acts smarmy towards Gimli, the two always end up being there for each other. This is an exaggeration of a similar relationship in the books.
Gimli: Never thought I'd die fighting side by side with an Elf. Legolas: What about side by side with a friend? Gimli:Aye. I could do that.
Aragorn and Boromir. Boromir initially dismisses Aragorn as just a Ranger with an empty claim to the throne of Gondor. While their relationship was never openly hostile, there was underlying tension between them. It's not until Aragorn promises the dying Boromir that he will not let their people fall (marking the first time Aragorn accepts his legacy and responsibilities) does Boromir acknowledge Aragorn as his captain and king with his last breath.
In Made, the two main characters are best friends from high school, but they bicker almost nonstop due to Bobby's short temper and conservative approach in contrast to Ricky's loud, reckless and unreliable personality.
In The Magnificent Seven (2016), Faraday and Vasquez spend most of their time frequently insulting and trading derogatory racial jokes between each other, but eventually became very close friends, as seen when Faraday is shot by one of Borge's main henchmen. Vasquez guns the henchmen down vengefully while screaming curses.
The Martian: Watney and Martinez are astronauts on the same multi-year mission, and Martinez is the first to agree to commit mutiny and return to Mars to save Watney. That said, every single sentence they exchange contains some form of jab at the other.
Martinez: Sorry we left you on Mars but... we just don't like you. It's really roomy on the Hermes too, now that you're gone. We've been taking turns doing your duties too, but, I mean, it's just botany, not real science.
Watney: And Martinez... I'm still trying to figure out what your job is. Honest to God, I couldn't tell you. I still don't know why we brought you along.
Midnight Cowboy: Joe and Ratso are always arguing over something petty, calling one another names, and generally at each other's throats. They're also one another's best (and only) friends. Joe is left in Manly Tears by Ratso's death in the end.
In My Girl, Vada and Thomas J are best friends and throughout the movie, Vada can be seen fighting with him and other times she is seen having fun with him. All in all, Vada cares deeply for Thomas J.
Will Turner and Jack Sparrow. The principled blacksmith and scheming pirate are frequently at loggerheads, but in the first movie Will risks everything to rescue Jack from the gallows, and in the third, Jack sacrifices immortality to save Will's life.
Jack and Barbossa begin to show shades of this in On Stranger Tides.
Sherlock Holmes and John Watson in Sherlock Holmes (2009). Watson always remarks Holmes is too much for him to handle and constantly tries to get out of joining him on his various jaunts, yet invariably they end up working together because Watson likes the chase almost as much as Holmes and they are in sync during investigations, whether or not he wants to accept it.
Snatch.: Turkish spells out this trope in the opening narration, regarding his relationship with Tommy.
I give him a hard time, but... he's like a brother to me.
Luke's relationship to Han Solo. Especially when they're arguing over Leia.
R2-D2 and C-3PO qualify as well. Especially evident in A New Hope where they spend half their screentime bickering with each other, yet are inseparable, with 3PO frequently showing concern for R2.
Stroker Ace and his chief mechanic Lugs. They argue back and forth about little things and criticize each other's habits. They also team up in bar fights and work together to help Stroker out of his unfair contract. Best seen when Lugs , mistakenly thinking that Stroker forcibly slept with Pembrook, hunts Stroker down and punches Stroker in the face. Neither one mentions the incident at all, continuing on like it never happened.
In Teenage Mutant Ninja Turtles (2014), Raphael is constantly at odds with Leonardo, hates being told what to do, and mentions that he's leaving the group the first chance he gets. However at the end, he defers to Leo's leadership and tells the others to do the same, as well as confessing that he says he's leaving because he's really just scared that he's not as good as them, and he only says that to make them bond harder when it feels like things are driving them apart.
Tommy Boy: Tommy Callahan and Richard Hayden spend much of the movie trading insults with each other, but when the chips are down, they have to admit that they consider each other friends.
In What a Carve Up!, Syd and Ernie spend a lot of time insulting each other. However, when the chips are down and there is a madman running around the mansion offing the guests one by one, they've got each others backs.
Pearly Gates and Inspector Nosy Parker develop into this by the end of The Wrong Arm of the Law.
In XXX, Xander Cage and Augustus Gibbons have a tense relationship from the start, since Cage is a rebellious extreme sports star with little interest in authority while Gibbons is a government agent seeking to recruit Cage as an unconventional asset. Cage even goes so far as to fake his death to get away from Gibbons' authority, but is ultimately tracked down years later (Xx X Return Of Xander Cage) after Gibbons has been killed by an unknown terrorist group. When Cage initially meets Gibbons' successor, Marke, he openly dismisses the idea that he and Gibbons were ever friends, but when faced with the man directly responsible for Gibbons' death, after one of Cage's team kills the man with a shot to the head, Xander takes the time to stand over the man and declare "That's for talking smack about my friend Gibbons".
