Do you want to know how I got these scars?

What the Joker says to people before telling them a story about how he got the scars on the sides of his mouth in The Dark Knight. The first story involves his drunk father killing his mother, then cutting the sides of his son's mouth with a knife to make it appear as if he is always smiling. This is where the line "Why So Serious?" is said in the movie. The second story is different, in which he talks about his wife. He states that he puts a razor in his mouth and moves it around, therefore cutting himself, giving himself more scars.