Movies about Fighting for Your Mind
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refer.ly
* Abre Los Ojos (Vanilla Sky is the shitty American remake of this film)
* Revolution #9 (best fictional depiction of schizophrenia I've ever seen)
* Memento (filmed backwards, about a man with a 5 minute memory)
* Fight Club
* The Game
* Naked Lunch (the last good Cronenberg movie)
* Videodrome
* Dead Ringers
* Zoo: A Zed and Two Noughts
* Last Year at Marienbad
* Requiem for a Dream
You should add The Thirteenth Floor. A good movie, better than its low budget, that fits squarely in the category.
Glad to see someone suggested The Game. I loved that one. It's a long way down from The Game and Seven to Benjamin Button and The Social Network.
I'm also in the middle of watching Dollhouse, which is an incredible TV series by Joss Whedon dealing with mind control. I think it does a better job than Gattaca of dealing with ethical quandaries of bio-tech, and most likely the more difficult battle we'll fight as our brains become more akin to software. The arguments in Gattaca seem like a straw man that very few people would actually advocate.
Pretty much every movie involving amnesia.