A: I really need a book, but I didn't see it on the shelf.
B: According to the computer, it's not checked out yet.
A: Then why isn't it on the proper shelf?
B: It means that someone in this library is holding it right now.
A: So someone else has the book and plans on checking it out?
B: Either that or someone took it out of the shelf and misplaced it.
A: I really need that book.
B: You're going to have to look everywhere for it.
A: Can't you just make an announcement asking whoever has the book to come forward?
B: You are not that special. When it comes to books, it's first come, first serve.
A: But I need it for school.
B: I'm sorry, but I can't do anything for you.