Fan Casting The Joker in The Dark Knight

The Joker is a homicidal maniac and the archenemy of Batman. His real name and origin are unknown, but one of the most common versions indicates that he fell into a vat of chemicals which turned his skin white and his hair green. Completely unpredictable with no regard for human life, the Joker finds murder and mayhem funny, and is perhaps the most dangerous man on Earth with a body count stretching into the thousands, all centered around his obsession with the Batman.