Further adventures in book retail:

Customer: Do you have any books suitable for someone like me?
Sarah: Well, I don't really know you that well...

Customer (on phone): I need you to re-send me that Christmas list.
Me: ...what Christmas list?
Customer: You know, that list of books for Christmas.
Me: Uh?
Customer: The Christmas book list? For kids? I lost it. I need it resent.
Me: Are you sure we sent it to you?
Customer: Yes.
Me: Boss? Christmas kids book list for ordering?
Boss: WTF??
Me: Sorry, I don't think that was us.
Customer: Oh. Bye then.

Customer: What sort of bookshop is this?
Sarah: The sort that sells books?

Customer: Do you have that book? It was on TV.
Me: ...

But the winner is:
Customer (in the back shelves): Uh, excuse me?
Me: Yes, what can I help you w--OH MY GOD!
Customer's daughter: We just picked up a book and the shelf fell down.
Customer: help?