Fancy Feet

We are at the beach with a friend who has a daughter Clem's age. She is doing a strange jig. Friend's father to his daughter: "You are doing your fancy feet thing again. Do you need me to take you to the bathroom?"

Daughter looks down at her feet which seem to be moving of their own accord: "Yes."

They leave, and Clem gets thoughtful for a minute or two.

Clem: "Do you know what I am thinking?"

Me: "What are you thinking Clem?"

Clem: "Feet are the first thing to get fancy when you need to go to the bathroom, but when  you really need to go your bum gets a bit fancy too."