What about "Independent Book Store" = must have everything ever printed exactly when you want it?

I will never understand the grumpy customers I have to deal with on the phone that ask for a book about WWI, then are irritated when I tell them that I haven't read it (do I sound like google library? Is it logical to assume that I have read every book that YOU like?), then berate me about our book availability. "You know I always want to buy from your store but you just never have what I want." or my favorite:

"I'm sorry it looks like it's out of stock"

"Well. That doesn't help me."

"I'm sorry. Would you like me to order a copy for you?"

"No. Why don't you ever have what I need?"

"I'm sorry..."

I mean, what am I supposed to say to that? The store has quite a good and broad selection for an indie and the staff will try its best to help you get the book you need. Please keep in mind the constraints of time, space, and the US Post. When you bring us a Transporter we will be able to instantly beam any book at your convenience.

Advice to consumers: If what you are looking for is a place where you can purchase any book, no matter how obscure, at any time. Shop at amazon. By the rules of the universe, no matter how hard this little bookstore tries it will never be able to have every book in an unlimited quantity. This store is not the planet library from Dr. Who....although I do wish we had a few Vashta Nerada to dispatch the more, shall we say, unpleasant customers.