None because they pee sitting down.
A: Everyone knows a Mercedes Bends!
She kept sitting on Pinocchio's face and screaming "Lie to me! Lie to me!!!"
It don't need cleaning!
Novak.
Moose-saka
Swim down and knock on the hatch. (In Sweden we have a running tradition of telling jokes about stupid norwegians. They do the same about swedes)