In the Christopher Nolan film The Dark Knight, Heath Ledger offers a realistic (and disturbing) version of The Joker as a murdering psychopath. In the film, Ledger's character gains a dark and mysterious air, in part, due to his uncertain origins. What I'm referencing, of course, is the varying stories of how Heath Ledger's Joker got his scars. What follows are the two stories The Joker gives for how he got his scars:

1. My father was a drinker and a fiend. And one night he goes off crazier than usual... Mommy gets the kitchen knife to defend herself. He doesn't like that. Not... one... bit. So, me watching, he takes the knife to her- laughing while he does it. He turns to me and says "why so serious?", comes at me with the knife, "why so serious?", sticks the blade in my mouth, "lets put a smile on that face"... and... why so serious? 

2. I had a wife, beautiful like you, who tells me I worry too much. Who tells me I ought to smile more... Who gambles and gets in deep with the sharks. Then, one day, they carve her face and we don't have money for surgeries. She can't take it. I just want to see her smile again, hmm. I just want her to know that I don't care about the scars. So, I stick a razor in my mouth and do this... to myself.  And you know what? She can't stand the sight of me! She leaves! Now I see the funny side... now I'm always smiling.