Little Johnny had a tummy ache.
He said to his mum, “I’ve got a stomach ache”.
“That’s because your stomach is empty,” she told him. “You would feel better if you had something in it.”
Later that day, Little Johnny’s dad came home complaining about a severe headache.
Without missing a beat, Little Johnny piped up, “That’s because it’s empty Dad.”
“You’d feel better if you had something it.”