Don't rub it in.

chap walks in and stands at the door. I've never seen him before. He doesn't actually bother looking at the shelves.

"Good morning" he says, "I hear an Oxfam bookshop has opened up, can you tell me where it is please ?"

I just told him - I couldn't even be bothered to rant about how they are destroying the book trade. I must be losing it.