Overheard at the checkout desk:
Head of circulation, to woman who is renewing the library cards of her two children: I bet you didn't realize this would be so much work!
Woman: No, I pretty much expected it. My mother used to be a librarian.
Child #1: What!?
Woman: You never knew that? Why do you think all the books at Grandma and Grandpa's house have the Dewey Decimal system!?