One day, Johnny sees his father getting out of the shower.
“What’s that hanging between your legs?” he asks.
“That’s my nerve,” says his father. “Yours will be this big one of these days.”
The next day in school, Johnny asks to use the toilet.
“In a minute,” the teacher tells him. “Nancy has just gone to the bathroom so you’ll have to wait.”
Unable to hold it in, Johnny walks over to the garbage can and starts to pee in it.
The teacher turns around and is shocked by the sight.
“Johnny! You have some nerve, boy!”
“That’s nothing,” says Johnny, buttoning up his pants. “You should see my father’s.”