A man walks into a library and says to the librarian, "Do you have that book for men with small penises?"
The librarian looks on her computer and says, "I don't know if it's in yet."
"Yeah, that's the one!"
Small Penis Book at Library
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Explanation
Experiment
The humor comes from the double meaning of "in". The man is looking for a book about men with small penises and the librarian replies "I don't know if it's in yet". By answering like this, the librarian inadvertently implies that she knows about the book, but the man thinks it's about the size of his penis. It uses self-deprecation in a humorous way.