Star Wars - I've seen every movie so many times that I can't even keep track anymore.
Battle Royale - I absolutely LOVE this movie, although the book is much better, in my opinion.
Donnie Darko - I've seen this movie countless times, since i've been trying to figure out the significance of certain scenes.
V for Vendetta - I can't get enough of this movie. It really makes ya think
There's others, but I can't think of 'em at the moment.