In the 2-disc version I have there's a documentary about the horror movies of Universal. One film mentioned (I think it was a silent film) was something called The Laughing Man
or something like that. This man is disfigured since childhood with a permanent grin on his face. But what really struck me every time I looked at him was that he was a dead ringer for the Joker in Batman
. I couldn't help but wonder if by some slim chance this was an inspiration for the Joker's appearance.