Fletch The scene where Chevy Chase is running from the cops and he grabs the mic and improvs at a tribute to Fred "the dorf" Dorfman
Good Will Hunting- The scene where Ben Afflek basically tells Matt Damon that he's pissing his life away if he's still hanging around and not taking advantage of his smarts
Clerks- My girlfriend sucked 37 dicks. In a row?
Casino- The scene where Joe Pesci threatens to put the banker into a coma.
Goodfellas- The scene where they threaten to throw the mailman into the pizza oven.
Disappointing my parents since 1976