I had a similar experience a few years ago. I was in one of those pubs where you get served and pay the waiter/waitress.
The bill came to (can't remember but let's say ) I took out a "£10 note" and gave it to the young waitress. She gave me back $ obviously thinking I had paid with a £20 note!
Within a fraction of a second, I realised that the waitress had made a costly mistake, at her expense. I thought hard and fast about what to do. I remembered all the fat profits that that chain has been making, the number of broken relationships due to people drinking to excess in that pub (and others!), the huge amount the government rakes in in the form of taxes on alcohol, the unfairly excessive price of alcohol anyway, the fact that I had to walk home and needed a taxi -- and then I looked at the angelic face of the young waitress, probably a student doing holiday work who would probably have that £10 mistake taken out of her wages -- and then, I just called her back and explained her mistake while handing her back that £10 note, which she gracefully accepted.
I left the pub, happy and pleased with myself.
When I got home, and had another look at the contents of my wallet, I then realised that in fact I HAD paid with a £20 note in the first place.
Well, there you go. Believing in angels can sometimes cost you £10 a pop!
