* Animal House, Dexter Lake Club, full of black people; "Mind if we dance wif yo' dates?"
*Untouchables, Kevin Costner throws the guy off the top of the building; "Did he sound anything like that?"
*Casino, Joe Pesci and his brother become batting practice in the middle of the cornfields.
*Night Of The Hunter, Robert Mitchum singing Leaning On The Everlasting Arms.
*Un Chien Andalou, the eyeball scene.
*Matewan, Mary McDonell guns down union buster Kevin Tighe amongst her laundry.
*Stir Crazy, Wilder and Pryor walking into prison for the first time.
*Monty Python/Holy Grail, Constitutional peasant.
*Blazing Saddles, Mel Brooks office scene with his advisors and secretary. "Gentlemen, affairs of state must take precendent over affairs of state".
That's all I can think of top of my head.