I'll tell you what's creepy - how you are all reading my mind! I went through the thread and every time I came up with somebody original it was right there. Some nice obscure references as well.
I think you have to give credit to DeNiro (Taxi Driver) and Hopper (Blue Velvet) for being sort of the fathers of invention with this genre. I don't think I saw Tim Roth for his character in Rob Roy - um, unsettling to say the least. Also props to Malkovich for his Claus Von Bulow and of course Nicholson for The Shining.
Oh yeah, and that dude in the movie "Misery" who kept breaking James Caan's legs. That guy was scary.
