Billy's Dad: Son, it's awfully hard to read the paper through your ****
Billy's Dad: Billy, I've never told you this and I probably never will again... but I love you, son.
When they were at the mall:
Grim: Oh, poo!
Mandy: What now Grim?
Grim: It's just that when you said we were going to a "mall," I thought we were going to see people getting teared limb from limb by a ferocious beast. Not this!
Grim: My name is Grimmy and I've come to reap your immortal soul.
The smarest thing Billy ever said:
Billy: Why do you have to hate each other? Can't you see you're just like peas and mashed potatoes? Some people don't like them to touch each other and they're on the same plate! But it's okay! It's okay if they touch because they both get chewed up by the mouth, and sent down the esophagus and dissolved into the stomach and absorbed into the intestines and we won't go any further than that. But the point is, we're all just nutrients in the great big digestive system called LIFE!
My favorite:
Billy: Hey, guys! Guess who's going camping!
[Camera pans out to reveal Billy tied to the roof of his car]
Billy: MEEEE!
Irwin's dad: Yes, Irwin's mom is actually a mummy. Nobody can tell you who to fall in love with. But we've managed to make it work all these years leaving a whole lot of questions that don't need to be answered.
Billy: Yeah, but how and you and Irwin's mom...?
Irwin's dad: Leaving a whole lot of questions that don't need to be answered
Billy: Why, Grim? Why do the good die young?
Grim: Well, usually because I get confused.
Last one:
Grim: [a small monster has latched onto Billy's head] I tink it's tryin' to suck his brains out, mon!
Mandy: Poor thing's gonna starve.