Having Fun Heath was very much himself on set, and would often skateboard around in his full joker costume. He would do his best to make the other actors and crew relaxed and happy, despite looking like a psychopath in his costume.

Lend a Hand The clapping the Joker does while in his cell when Gordon is promoted was unscripted, but Christopher Nolan told the crew to continue filming and the scene made it into the film.

. Masked The mask the Joker wears during the bank robbery is extremely similar to a mask worn by Cesar Romero in an episode of the original Batman TV series from the 1960s.

Make-up Artist Heath designed the make-up look himself, using drugstore make-up, because he thought that's exactly what the Joker would do. The make-up artists working on the movie had the task of replicating that look everyday on set.

Scar Face The scars on the Joker's face aren't originally from the comic books. The scars for Ledger's Joker were inspired by Gyonplaine, a character from Victor Hugo's novel The Man Who Laughs.

Age Doesn't Matter Heath Ledger is the youngest actor to have played The Joker, but it's clear he held his own against bigger, more famous actors who have taken on the iconic role.

1. Locked Up To really get into the Joker's head, Heath locked himself in a motel room for 43 days. This allowed him to feel isolated and alone with his thoughts and perfect the crazed Joker we all saw on screen.