A man bought a new bathroom scale, and is having breakfast with his blonde wife.
She: “The new scale is great! Since we got it, I can check how much I poop.”
He: “So you step on the scale before you poop, go to the toilet, step on the scale again, and the difference is the weight of your poop?”
She: “Oh! …that way seems to be a lot easier… and less cleaning up afterwards”