Especially for public librarians:
Sherlock Holmes is called in to investigate a murder. After examining the scene Holmes announces that the killer was a librarian.
“How can you tell?” asks Dr Watson.
“Elementary my dear Watson. First the murderer not only alphabetized the victims books, but shelved them by genre.
“There is the fact that the murder itself was clearly inspired by a rare Victor Hugo novel recently acquired by the branch library down the street.
“However the real give away is that after the victim was killed the murderer dragged his body over to the toilet and wrote on the body ‘can you find the bathroom now?! can you find the bathroom now?!”
Thanks to Dave Lankes for the morning chuckle.