"He who writes on shithouse walls, rolls his shit in little balls,
"And he who reads these words of wit, eats those little balls of shit."

And then there are "guy" seats, with an opening in the front, vs. "gal" seats that are a closed oval. If you combine a small john with a small gal's seat and a guy with a big butt, there are fit issues to deal with. And I'm not talking about...never mind.