Louise: Well, how are we supposed to concentrate at school anyway? We're in the middle of a pinworm epidemic. There are pinworms crawling through kids' stomachs, laying eggs in their anuses, and I'm supposed to be able to think about what two plus two equals?
Bob: Wait, is that what you're being taught in math right now?
Louise: Butt worms, Dad! That's what I'm being taught!