S4E11: Peter's Got Woods
Oh, yes. Just as I thought: France, art...
Well, this is a bigger surprise than that time Peter vanished into thin air.
- Hey, Stewie. Peekaboo!
- Yes, I see you, fat man.
Where did you go? Oh, this is impossible.
I can hear you, but I can't see....
Well, he must really be gone!