An exclusive bonus featurette that will be on The Dark Knight DVD has been released courtesy of The Guardian. The Dark Knight DVD will be available on December 9th.
Finally, clip No 3 centres on Ledger's Joker. Nolan talks about creating a "purposeless criminal, the enemy who has no rules, is not out for anything and cannot be understood". Bale discusses why he believes the Joker is such an impossible opponent to face. "He enjoys highlighting man's hypocrisy and making people question their values and how sincere they are," he says.