S6E14: Bart's Comet
Uh, I'll make the sound of a barnyard animal,
and, uh, y-you all try to guess what it is.
It's a pig!
It's a cow, man.
It's a pony!
No, it's a goat! You know, one of them lady goats.
There are no lady goats. A lady goat is a sheep.