Posted this in another thread but thought i should add it here. Sums up my feelings on the joker.
I like the idea of him not reapplying or taking it the make up. Its almost as if one day this guy went nuts and put the makeup on believing he was the joker. now he is so insane that he doesnt believe he needs to reapply it because that persona is all he believes. as the make up gets worse he is sinking deeper into psychosis. the concept now that i look at it is really ingenious. I also like that there is no backstory. sometimes a back story isnt necessary, one day this guy shows up. We are put in the same position as Batman, one day we just have to deal with this guy. besides if the joker had a back story then we might empathize with him if we see what he was before. Nolan doesnt want us to empathize with the joker, he wants us to be terrified of him. All i hope is that at the end the joker ends up at Arkham, just like the comic books, and at the end we are left thinking that the joker wont be behind those walls forever, sort of a devious smile or something to show gotham hasnt seen the end of his terror.