Possibly two of my favorite movies of all time: Schindler's List and Requiem for a Dream
Horror/Suspense/Thriller: 6th Sense, Memento, Seven (although it was a little too predictable), The Ring
Comedies: Wayne's World (both of them), Monty Python and the Holy Grail, Napoleon Dynamite (yes, I know.....), Dumb and Dumber, Tommy Boy, Black Sheep, School of Rock, The Incredibles, Snatch, Toy Story 2, I also enjoy Mel Brooks films...
Drama: Magnolia, the Royal Tenenbaums (is that a drama?), JFK (which I suppose is more historical-type), Fight Club, Being John Malkovich, Blow, and does Eternal Sunshine for the Spotless Mind fit in here?
Historical: JFK (which I already listed), Hotel Rwanda, Sylvia (I guess that's historical)
Documentaries: I really like Michael Moore ones.. I think he's good at what he does; March of the Penguins, Winged Migration, The War Room, Outfoxed,
Foreign: Amelie, Triplets of Belleville
and wherever the hell I heart huckabees and edward scissorhands fits..
and tons more that I forgot. Damn, there's so many good ones...
and I'm with cnredd - I hate Adam Sandler! Except for his performance in Punch Drunk Love.