Little Susie

[rebbonk]

Little Susie, a six-year-old, complained, "Mummy, I've got a stomach ache."

"That's because your stomach is empty," the mother replied. "You would feel better if you had something in it."

That afternoon, her father came home complaining that he had a severe headache all day.

Susie perked up, "That's because it's empty," she said.

Spoiler:

"You'd feel better if you had something in it."