Jack Geller: This one time I had my knee up on the sink, and your mother was-
Monica: Daddy, I don't think we need to hear about the specific positions you and Mom had.
Jack Geller: You're right. You're right. This is about your positions. Now, what I saw in the closet is not the optimum position for conceiving a child. Although it might feel good.
Monica: I don't feel good right now.
Jack Geller: But pleasure is important, and it helps if the woman has an orgasm. You up to the task, sailor?
Chandler: Seriously, sir, my brains, all over the wall.