Why So Serious?

[holding a knife inside Gambol's mouth] Wanna know how I got these scars? 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! Turns to me, and he says, “why so serious, son?” Comes at me with the knife… “Why so serious?” He sticks the blade in my mouth… “Let’s put a smile on that face!” Aaaand…Why so serious?
[to Gambol's thugs, being held helpless by his own] Now, our operation is small, but there’s a lot of potential for “aggressive” expansion. So, which one of you fine gentlemen would like to join our team? Oh, there’s only one spot open right now, so we’re gonna have…Tryouts. Make it fast.