Mummy takes little Johnny to the zoo. As they pass the elephant cage, the elephant has an erection.
"What's that, Mummy?" asks Johnny. "Nothing, Johnny, nothing," says the embarrassed mother, swiftly leading him on.
A week later Johnny's dad takes him and the same happens. "What's that, Daddy?" "That, son, is the elephant's penis."
Johnny replies,"Mummy said it was nothing."      ......"That's because your mother's spoiled, Son!"