Pulp Fiction, It's a Wonderful Life, Some Like It Hot, Goodfellas, Rear Window, The Shawshank Redemption, old Star Wars, Life is Beautiful, To Kill a Mockingbird, The Silence of the Lambs, American Beauty, Heat, The Usual Suspects, The Big Lebowski, Fight Club, One Flew Over the Cuckoo's Nest, Taxi Driver, 2001, etc.
Some of those might be a little too recent to be classics, but they're classics to me. I love film.