not really a psychopath, but definitely fucked up : jack/tyler durden... and he used to be such a nice guy lol

the "I am godzilla you are tokyo!!" guy from
Things to do in denver when your dead.

Earnest.

Sy "The Photo Guy" Parish from One hour photo

Jim Carrey in "Cable Guy"

Robert De niro in Taxi Driver(this is actually my favorite none-horror movie)

Alex (Malcom McDowell) from A Clockwork Orange. He was just really messed up and loved every minute of it. I do get to talk to a lot of really messed up people though, I work graveyard shift doing technical support. Some of them make movie psychos look like Willard Scott in comparison.

how could i forget twisted alex

"i'm singing in the rain...."

Psycho
 

Hannibal Lecter
The Terminator (1984)
The Joker

max cady from cape fear