S10E18: You Can't Do That on Television, Peter
(IMITATES KNOCK ON DOOR) (HIGH-PITCHED VOICE) Peter!
(IN NORMAL VOICE) Oh, hi, Saggy Naggy.
(HIGH-PITCHED VOICE) Never mind with "hi!"
It sounds like someone's having fun over here!
You know I don't like that!
(IN NORMAL VOICE) Hey, kids. Meet Saggy Naggy.