Some people are offended by potty humor, and apparently think that if kids don't read Captain Underpants, they'll never learn potty humor. Actually, I think kids start figuring out potty humor when they're a few months old, when they figure out that 1) they mess their diapers, and 2) that gets a reaction, thus setting a lifetime pattern. (My dad and his brothers think toilet jokes are hilarious, and these guys are in their 70s and 80s).
"Oh, you can’t help that," said the Cat: "we’re all mad here. I’m mad. You’re mad."
"How do you know I’m mad?" said Alice.
"You must be," said the Cat, "or you wouldn’t have come here.”
- Lewis Carroll, Alice in Wonderland
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