When I was little I read a book about vikings that I liked. It was a children's book, many pictures and little text. It was borrowed from the local library.
Some years later I remember the book and go to the library to get it. I was embarrassed to admit I am looking for a children's book so I told the librarian I was looking for the history section. I have no idea why she was so offended by that, but she insisted I tell her the exact book, and got angry when I kept hesitating. I don't remember the details but in the end I got the book, and I was very disappointed when I noticed some pages were missing.