Quote from Kripke in the episode Spoiler: Bert is Magic
Kripke: Weawwy? I'm terribly sowwy, Bert. Pwease forgive me? Bert: You let them set me on fire. Kripke: It was peer pwessure. I am fiwwed with wegwet. Bert: They were going to burn me at the stake, and he did nothing! Stuart: Oh, Barry! Kripke: I know. I'm tewwible. Pwease change me back. Bert: Change you back? I should turn you into a maggot. Kripke: No, penguin's fine! Happy to be a penguin.