DC Comics' Joker has been a goofy trickster, a giggling lunatic, a psychopathic killer, a methodical mastermind, a failed comedian, and an unstoppable force. It all depends on the writer and artist telling the story. He's the Clown Prince of Crime, the Man Who Laughs, an agent of chaos. He has no special abilities or superpowers, but also no moral code or grip on reality. The Joker is charismatic, terrifying, unpredict-able, and downright hilarious...