I checked The Five Chinese Brothers out of my school library when I was in first or second grade... and never returned it. Somehow, in each of the three elementary schools I went to, there was one book I was supposed to return but never did. It was TFCB for the first school, an assigned textbook on Cincinnati history for the second, and an assigned textbook called The Story of American Freedom for the third. I didn't deliberately steal them, they just somehow slipped through the cracks, got misplaced until it was too late.
I'm a school librarian, remember. Send me your fines now and I won't tell.