Re: The Joker's background?
My take on it, is the scar-stories are Jokers way of alluding to one of his victims. He told Gambol one story, which I would assume was talking about the last person he gave a smile to, and then after Gambol, he told Rachel a story about his wife who used to gambol.
I don't think it has anything to do with his origin at all.
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