Grim & Evil (2001)

Billy's Mom: Oh sorry, Billy. We weren't laughing AT you, we were laughing with you.
Billy's Dad: I was laughing AT you.

A Grim Surprise / Beast and Barbarians - S1-E9

Trivia: In "A Grim Surprise" when Billy and Grim are in the closet, and Billy is telling Grim about throwing Mandy a surprise birthday party, if you look closely at the boxes behind them, one of them has the word "die" written on it. (00:09:20)