Mother, father, and son were having dinner, and the son wouldn’t eat his sprouts.

Mother says: “Son, eat your sprouts.” And he shouted, “NO!”
Father leans over and whispers in the boy’s ear.

The boy quickly eats his sprouts and goes to his room.
The mother says: “What did you say to him?”

Father says: “I told him his willy wouldn’t grow any bigger if he didn’t eat them!”

Mother slaps father around the head and he asks: “What was that for?”
“For not eating your sprouts when you were a child.”