Miss Information hates the summerToday, Miss Information witnessed a lengthy exchange between a patron and one of her colleagues. The patron insisted that a third colleague had intentionally misled her about the availability of a video--uhm because he's an evil bastard who likes jerking people around or something.
No amount of discussion could convince the woman that she was the victim of a run of the mill misunderstanding.
Miss Information realized that stabbing the woman would be more productive use of her colleague's time.
This is why the knives are kept on another floor of the library.