Why The Joker Looks Disfigured

In the Dark Knight the Joker gives various reasons for why his face is disfigured. The reason he does this, I believe, is for a multitude of reasons. First off he is insane, but intelligent insane, I think his main reason is for shock value, and pull some sympathy out of his victims. He trying to connect and mess with people on a psychological basis. He may also be relaying things that might have been true about his past; this is a part of his sympathy method, but also to point out some injustices in the world. Its not important whether they are true or not, but because he is relaying these things to others, he is voicing shocking. But basically even though there is a method to his madness, he is just insane and has fun messing with people and it just ends up being clever.