Great Movies with Big Twists? (no spoilers please)?

I just saw Primal Fear With Richard Gere and Ed Norton and it was terrific and had a fantastic twist but unfortunately i already knew what was going to happen and it really wasnt as enjoyable as it should of been. i know of some good movies like this with twists like Fight Club, the prestige, donnie darko and was wondering for a few more please. thanks. (no Spoilers tho thanks)