Movies with a twist....

[alexd231232]

I'm looking for some more movies that have twist endings. I've seen all the obvious choices: Fight club, Usual Suspects, Snatch, etc etc. Looking for some that aren't maybe as famous but are still amazing in terms of that twist at the end that makes you realize, holy crap, what just happened.
By the way, one that many haven't seen which i think should be in this category is Basic- just an amazing twist at the end of that one