Me: I'd like to reserve two copies of the new Harry Potter Book
B&N Employee: I can't guarantee that we will have a book for you on Saturday, but I'd be happy to take your reservation, sir.
Me: Excuse me?
B&N Employee: We have been told that we can continue to take reservations, but that unless you have the book in your hands on Saturday -- or on Midnight Friday -- we can't tell you you we will definitely have enough books.
Me: Didn't I see this in a Seinfeld Episode once about a Car Rental Counter? I'm not sure you understand the concept of a reservation...
B&N Employee: I understand what your saying, but that's the way it is. By the way, I love that episode of Seinfeld...
Me: Thanks anyway.