Chap comes in. He has been a pain in the neck for a long time - always wanting discounts, free books etc:
He recently ordered two books - then decided he only wanted one of them - costing me £20.
"I'd like you to order me in a book"
"I'm not very keen after last time"
"What do you mean?"
"Well I got you two books - and you only paid for one. The other cost me money and I can only sell it for a fraction of this"
"Well that's not my problem - I took one of them"
"Yes but you ordered two - I have to buy books in - I can't get them on approval"
"Just send it back and say you've changed your mind"
"But i haven't changed my mind - and I can't just return books because customers are unreliable - there is postage to be paid in each direction"
"Not my problem - now are you going to order this book for me?"
..............I don't think i will be seeing him again.