K-Pax
I liked it. I like the way it left conclusions to the audience to make. I think that might be the reason some people don't like it though.
Good plot, good twists, good direction, good cast.
Note: I saw a special on E! about K-Pax and Kevin Spacey actually did eat that banana, not fake. Actually it took like 8 takes, so he ate 8 bananas. He said he was on a potasium high for 3 days. Pointless trivia, but I thought it was interesting.