Grossest Joke Ever:

A girl asks her dad for the car keys to go to her high school dance.
"Sure, after you suck my dick", he says.
"DADDY!?" she shouts, "how COULD you!?"
"Sorry, but those are the terms."
She stomps off with a whimper.
A little later she decides that she just can't miss the dance, so she returns and gets to work. But there's some foul taste.
"Daddy, your dick tastes like shit!"
He slaps himself on the forehead and says, "oh yeah! I forgot. Your brother has the car."