Francine: (stepping into the boys' room at school) Ha, I knew it! You can't save water at home and waste it somewhere else, Arthur! I'm calling a twenty liter penalty!
Arthur: Oh yeah? Well, I call a 200 liter penalty on that certain shower you took at a certain friends' house!
Francine: (gives a dirty look to Muffy, who was listening in)
Muffy: Sorry. It slipped out.