S11E22: No Country Club for Old Men
Just don't fucking say anything, okay?
Oh, you know what? Hang on, I left my harmonica in the tub.
I think Peter's in there taking a bath.
PETER: (SCREAMS) Son of a bitch!
What the hell did I just sit on?
Where is it? Where's my harmonica? It's not here!
Peter, have you seen Stewie's harmonica? It was in the tub.