Star Wars - aka 'Episode IV', aka 'My Name Is George And I Don't Know When To Leave Things Alone', aka 'A New Hope', aka 'the original and still the best', aka 'he'll change it again when it comes out on blu-ray, the fool'.
I'm not bitter, honest.
I think I know that score pretty much off by heart.
Also, Aliens, Beetlejuice, Jaws, The Great Escape, The Magnificent Seven, Ride With The Devil. Ooh, I really like Apollo 13, as well.