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.