THOMAS: Silly Boo-Boo! Silly Boo-Boo! Whatchoo doin' with that string? Huh? (to DAD) Is he allowed to do this?
DAD: As long as he doesn't chew on the plastic parts. He likes to chew on the balls.
(THOMAS and DAD look at each other. Neither can realize if the other person realizes the full implications of what has just been said.)