In Little Orphan Eric, when the gang decides to save Eric.
Trevor: Let's go blow up an orphanage!
The episode with the superbabies where Trevor makes them his own army and wants Eric to co-rule with him or else. One baby uses his hammer toy on him and Eric scolds, forcing him to apologize. Then he steals the toy and bops every baby like a softball out of the way.
The above is from "Fart of Darkness". another is in the same ep; Kitty and Vana volunteer at the super kidnergarden and Eric and Trevor disguise themselves.
Kitty: Awww, aren't you two chubby, haha. Maybe we should skip your afternoon cookies?
Trevor (as they're walking away): You do, and I'll throw the biggest tantrum you've EVER SEEN!