Welcome to the Dark Side

I think my favorite type of villain is not necessarily good intentioned, but at least has a few redeemable qualities.  Clear cut villains are typically boring.  Those with a dark and twisted past, where you can actually see where he went wrong, maybe even be sympathetic to his plight, the ones you just KNOW would be the protagonist had their circumstances been different, had they known this one fact or turned that last corner back there...I think those are my favorite types of villains.  The ones who keep you up at night because they have SOMEHOW slipped beneath your "root for the good guy" blinders and become your favorite character.  Everyone has darkness inside them.  Some people just let their evil freak flag fly.