The Joker

"Oh, all it takes is one bad day to turn the most sanest man alive to absolute lunacy Bats. That's how far the world is from where I am. Just one bad day. You had a bad day once. Am I right? I know I am. I can tell. You had a bad day and everything changed. Why else would you dress up like a flying rat? You had a bad day, and it drove you as crazy as everybody else... Only you won't admit it!"

- The Joker taunting Batman The Joker is a infamous homicidal maniac and serial killer who is one of Batman's most famous adversaries and his famous archenemy, being the complete opposite of the Dark Knight himself.