Una risa inglesa.

A father was reading Bible stories to his young son. He read: "The man named Lot was warned to take his wife and flee out of the city but his wife looked back and was turned to salt." His son asked: "What happened to the flea?"

Otro:
A flea and a fly in a flue
were imprisoned so what could they do?
Said the flea "let us fly"
said the fly" let us flee"
so they flew through a flaw in the flue.