I just finished watching Shutter Island.
I was expecting it to be scary but it wasn't. It was a mind bender.
In the last scene I was like 'What the...' So I just Google'd and got some great views from other people that make sense.
It's not a movie I will easily forget.
Leonardo DiCaprio, you are a FANTASTIC actor. Absolutely flawless.
Update: Click here if you want to know the truth of the sane/insane debate.