One day little Johnny goes up to his grandad and asks, "Grandad, what's a cunt?"

The grandad looks at him for a while then goes and gets one of his old porno mags. He flips it open, pages through and leaves it open on a picture of a naked woman posing.

"You see those two stars up there on top and that little black bar down below Johnny?"

"Yes."

"Well the person who put them there is a cunt."