Example if both Spider-Men fight Ryu they'll ask him about his beef with spiders and Ryu will reply about being traumatized by a childhood prank.
Captain America squaring off against Talbain makes reference about the time Cap was a werewolf himself.
Conan would call out Wesker for violating both the living and the dead, saying his "science" fouler than the blackest of sorcery.
Cable or Dr. Strange would tell Menat that the future is always in flux and not to rely on her crystal ball.
B.B. Hood wants to make a pelt out Rocket Raccoon replies with saying she'll be the skin rug herself.
Charlie and Winter Soldier compare each other's situations.
Ultron taunts Mega Man or Roll as long as they have a child's mindset they'll never evolve past their programming. They reply by saying it's vice versa that Ultron won't grow beyond his hatred for organic life.