Even if you don't know the twist at the end of the movie Psycho, you can still tell that there are a number of things wrong with this guy, and you would really want to keep your distance if you were in the same room as him. He has all the signs of somebody who is about to snap. His timid manner, the fact that he fidgits uncontrollably, that he has an infatuation with his mother. You just get this feeling that he is not in public who he is behind closed doors, and when somebody tries to pull of such a nice guy persona when you know the he is sheltering some kind of dark demented secret, it makes him not only scary as a character, but as a person. When the awful truth about him is revealed, it becomes one of those movies where you watch it again and say "Wow! It all makes sense now!" And what is a villain without a creepy smile? And Norman has one of the most iconic creepy smiles to date.