Quote from Peter in Crazy Chin
Hank: But why do you do it? Are you using your chin to test the temperature of your food? Pat: Oh, that's silly, Hank. He'd have a big red mark on his chin every time the food was too hot. Hank: That's true. So it's not that? Peter: That's where his mouth was when he got here. He's still growing. [laughs]