Bloke in a giant mouse head who picks fights online and fills arenas, can't really argue with it.
Fun fact: His stage name came from finding an actual dead mouse inside his computer while building it.
Heath Ledger turned up, did that, and now every comic book villain is just trying to keep up.
Fun fact: "Heath Ledger locked himself in a hotel room for six weeks to develop the Joker's voice and mannerisms."