http://audionewsroom.blogspot.com/2008/05/howard-scarr-sound-scientist.html That's an interview with a sound designer on the soundtrack. Which means he programs synths, basically. Only interesting for those who are into synthesis, I suppose!
Just adds an extra layer of disturbing mystique to the Joker character. Speaking of which, I don't think the icky half of Two-Face shot has been posted here yet... http://www.iwatchstuff.com/2008/05/06/dark-knight-two-face-art.jpg I think I'd be inclined to take up a life of super-villainy after an accident like that too.