Anchorhead said:

Stress and anger are killers.

Plus, they lead to the dark side.

I watched Shutter Island again last night.
SPOILERS::
My cousin was convinced that DiCaprio's character actually was a cop, and everyone on the island actually was setting him up to look crazy, even though he wasn't. I tried to explain to him that everything that happens at the end of the movie is truthful, and that he really was Andrew Laeddis, but he refused to believe me! After I convinced him to watch it again, he finally gave in a little, but still insisted that his version could work just as well. *sigh*

Sidenote: Watching it after not having seen it for a while was very enjoyable, you really pick up on a lot of intricacies the Scorsese worked into the film. Awesome movie.