This is very tough!
But movies I consider my favorite are The Monkees' Head, 24 Hour Party People, Lost and Found Video Night series, and any strange, odd, or super cheeseball movie.
Current favorite is Kill Bill Volumn I. Violence is cartoonish, acting is wonderful, and there are literally hundreds of tributes and "in-jokes". Every piece of music and every line means something. I enjoyed Volumn II, also, but it didn't quite have the kick of the first one.