Ever met the stern librarian?

Ever met the stern librarian?
I often wonder why all librarians, regardless of their sex, appear so grim? Wouldn’t you think that beneficiaries of possibly the best job in the world, who have access to a wealth of knowledge, should have amiable countenances? But that’s not the case. To cast someone as Charon — the ferryman who carries the souls of the dead to the other world — a casting director only has to find a librarian.
Step into a library, and you are greeted with a “why have you come here?” look by a perpetually dour librarian. Instead of being drawn by a welcoming ambience and the attractive smell of books, you are made uncomfortable by the hostile vibes of the librarian.