Bullseye tries to carry out a contract on Deadpool given to him by Osborn, and they spend the comic trying to kill each other in various ways. Deadpool and Bullseye end up sharing a laugh about it all at the end. Halfway through the fight, Bullseye decides he doesn't actually want to kill Deadpool because he enjoys their fights too much. Seeing as this is Bullseye we're talking about, that's no small feat.
In the Joe Kelly era, Bullseye and Deadpool reminisce about the time they fought over Heinrich Zemo's grave and beat each other with his corpse. They have a laugh about it later. This trope pretty much sums up Deadpool's and Bullseye's relationship.
Fantastic Four: While Human Torch, Invisible Woman, and The Thing are fighting a horrifying monster the following exchange occurs:
Human Torch: It's horrible! Make it invisible! Make it invisible! Invisible Woman: Then how's Bennote referring to The Thing supposed to hit it? Human Torch: I was talking about Ben. Thing: Why you little... wait, that was a good one.
A flashback in The Infamous Iron Man shows that Ben is by no means new to this trope:
Ben: Just know that every day that I don't punch your nose into the back of your skull is a personal victory of self-control for me. Victor von Doom: Even if you were to accomplish that task, and I then needed to live the rest of my life in a hospice being fed my nutrients intravenously... know that I would still be your intellectual superior. Ben: Okay, let's test that theory, you walking pile of — no, you know what? I'll give you this... you are the king of awesome burns.
Spider-Man: In Peter Parker: Spider-Man #47, when Green Goblin tells Spider-Man what he was briefly going to call himself, they both start laughing.
Green Goblin: I wasn't always going to call myself "Green Goblin". At first, I was going to call myself "Mister Coffee". Can you imagine how weird the last few years would have been if I'd done that? [pause] [both crack up laughing] Spidey: Heh-ha-ha! Look out kids, it's Mister Coffee and his latte of doom! Goblin: Oh God, stop!
Wolverine: In All-New Wolverine #10, a pair of burglars break into Wolverine's apartment while she and Gabby are home, and Old Man Logan is there recuperating from his encounter with Fin Fang Foom. The trio find the entire situation hilarious, and are prepared to graciously allow the hapless crooks to leave. Up until they pull guns on them, and Jonathan — Gabby's pet wolverine — gets shot defending her (fortunately he gets better). Then it's all Laura can do to keep Logan from gutting them.
X-Men: In X-Men Unlimited #33, after a bunch of rednecks insult the Blob and enrage him to the point he declares he's going to level their town, the scrawny guy they were picking on first intervenes by making a bet with the Blob; if he can name something he can do that the Blob can't, then the Blob will leave the place alone. Once the Blob agrees, he reveals his challenge: for the Blob to touch his own toes. Initially, the Blob is furious, only to then burst out laughing and compliment the scrawny guy on his brains and guts. He then buys him a beer and leaves without causing any more of a fuss.
Thor: The Dark World: Thor and Loki are starting an argument about their dead mother that goes so far that Thor is about to punch Loki but stops himself, saying "Mother wouldn't want us to fight", whereupon Loki replies "Well, she wouldn't exactly beshocked." Thor can't help but chuckle.
Guardians of the Galaxy: After a whole movie of chasing Peter determined to get the orb he stole, Yondu can't help but grin when he receives what he thought was the orb holding the Stone, but turns out to just have a Troll doll inside. The movie establishes that Yondu utterly loves quirky little figurines.
Doctor Strange: Wong remains stone-faced against all of Doctor Strange's jokes, until the latter's Bond One-Liner after defeating Kaecilius ("You should have stolen the whole book because the warnings... the warnings comeafterthe spells.") causes him to burst out laughing, earning him surprised looks from Strange and Mordo.
When Loki is sent to meet Odin in Norway, he likely expects nothing but condemnation for putting his adoptive father under a spell and ousting him. Odin only laughs instead and admits that it took him a while to break Loki's magic.note He further explains he believes Frigga, who taught Loki magic, would be proud.
Thor can't help but chuckle when Hulk describes himself as a raging fire, and Thor as merely a smoldering one.
Thor openly smiles when Loki refuses his proposal to talk, dryly commenting "Open communication was never our family's forte."
Shang-Chi and the Legend of the Ten Rings: The reason Trevor Slattery survived All Hail the King is because the real leader of the Ten Rings found him hilarious and spared his life.
Spider-Man: No Way Home: Peter and MJ are chilling on the rooftop of their high school to get away from the crowds after Peter gets outed as Spider-Man, with MJ reading off various crackpot theories from a newspaper to pass the time:
MJ: "Some suggest that Parker's powers include the male spider's ability to hypnotize females". Peter: Stop. Come on! MJ:[jokingly]Yes, my spider lord. [Peter chuckles in response]
In X-Men, Wolverine uses his claws to flip off Cyclops, who chuckles in response.
