Taxi Driver - The scene where Scorcese is in the back seat talking about how he is about to murder his wife, and Bobby D, is up there like "Yeah, go ahead and kill her, why would I give a fuck?"
The Godfather part 2 - The part where he tells the old man his real name right before he guts him and also the seen where he kills the Black Hand guy then jumps up on the roof and disposes of the evidence.
The Fan - The part where he forces his old teamate (I think his name was Coop?) to catch for him while he pitchs to a kid he obviously has kidnapped, then busts him over the head when the kid runs off.
