A very silly woman came into the shop.
I knew that she was very silly when she asked "Do you have all sorts of books or just particular ones" (it took me a while to get it.... Or rather it took me a while to realise that there was nothing to get!)
She then says "Oh they are very expensive aren't they!" I replied that some of them are, and asked which she meant, and she said that the paperback she was holding was £1.50. I said that wasn't much, and she told me that she never pays more than 50p in charity shops for books.
I asked her to tell me which charity shops, as I would go there and buy some at once, which reminded me that unlike them, I had to buy all of my stock, pay my staff, market rent, rates etc: Eating occasionally would be nice too.