Little Johnny and the Bus Driver

So little Johnny was on the bus, and the bus driver already hated him. So he started to talk to himself JUST loud enough for the bus driver to hear.

"If my dad was a bull, and my mom was a cow, that would make me... a little bull!"

"If my dad was a rooster, and my mom was a hen, that would make me... a little rooster!"

And by this point, the bus driver was fed up with him, so he said:

"Ok little Johnny, I got one for you: If your dad was a drunk, and your mom was a whore, what would that make you?"

Little Johnny smiled and said: "A bus driver!"