S8E19: The Splendid Source
Mr. and Mrs. Griffin, the reason Chris was suspended is that he told a very inappropriate joke in class.
Well, Principal Shepherd, we promise you it won't happen again.
I don't know where Chris heard the joke,
but I can assure you, it wasn't at home. Was it, Chris?
No, Mr. Quagmire told it to me.
Oh, I should have figured.