Season 9, Episode 21: "The Clip Show"

You got the hen, the chicken and the rooster.

The rooster goes with the chicken.

So who's having sex with the hen?

-We'll talk about it another time. -But you see my point?

You only hear of a hen, a rooster and a chicken.

-Something's missing. -Something's missing, all right.

They're all chickens.

The rooster has sex with all of them.