Quote from Gob in Visiting Ours
Gob: Great news. Michael: Oh, good. I could use it. I just came from convincing Mom to have sex with Dad. Gob: God! What is wrong with you? That is disgusting! Michael: What's wrong with you? Gob: Oh, I'm sorry. But just the thought of Mom and Dad together... I have a sense of propriety, all right?