[Sammelthread] Uncommon psychic Disorders Movies

[Fincher]

This, for example:
http://de.wikipedia.org/wiki/Dissoziative_Identitätsstörung

Movies like
Fight Club, Secret Window (Das geheime Fenster), and some Hollywood Detective-thriller had used it I remember.

Oldboy used an uncommon psychic disorder, too.


Maybe you know some more movies where psychic Disorders are of somewhat key importance of lead to a major twist?

 

[MakubaX]

watch Shutter Island, is not too bad ^^
http://de.wikipedia.org/wiki/Shutter_Island