Although libraries are a place of solitude and mostly silence a lot can happen inside the walls. Inside those walls and on those shelves librarians guard the knowledge and power that lives inside of every book. But that doesn’t mean that these guardians also known as librarians can’t have a little fun.

From the most clever signs to quirky notes and even dressing up as a book reaper librarians all over the world show just how funny they are. Click through 30 of the best examples librarians have shown their patrons.