This was going back some time before mumsnet AIBU etc but its always stayed on my mind.
I bought some trousers from a charity shop once, they were quite nice i suppose and looked new.
Anyway when i took them to the till to pay the lady behind the till obvs liked them too and said nobody will ever know. She meant nobody will know you have bought them from a charity shop.
Was that a strange comment? So what if people did know?