Some of the most famous "psychopaths" didn't make the cut. Patrick Bateman in "American Psycho," Gordon Gekko in "Wall Street," Norman Bates in "Psycho," and Hannibal Lecter in "Silence of the ...

Psychopaths are probably most famous for their signature trait: a lack of empathy. But to count as a psychopath someone needs to have a lot more problematic traits than that. For example ...