All of those were good, but my favorite is from "The Apology"
George: What's this? A rage a holic meeting? I'm not here for rage, I'm here for revenge!
Man: We have a no-yelling policy at these meetings.
George: (stands up) Hey, am I talking TO YOU, PINHEAD? AM I?
Man: Please don't call me pinhead.
George also has some funny moments later in the episode