Oreos
I remember that, as a child, librarians always had really random and seemingly arbitrary rules about being in their space. You could sit, but you couldn’t lounge. You could drink, but only water. You could talk, but not too loudly.
Keeping the atmosphere of the library as sacrosanct is obviously a pretty hard job, and no it seems that librarians are having to battle against the evils of chocolate biscuits too! I really want to know what happened to result in Oreos being banned. I bet it was hilarious!