I was at a festival a few years ago, and got some food from one of the stalls, When I paid for my food, I was only give change back for £5, rather than £10. I noticed straight away, and voiced my concerns, in a polite way. The person who served me, totally blanked me, and moved to the back of the stall out of sight. It was only me then kicking off, that someone else on the stall acknowledged me, and handed over the rest of my change. No apology or anything.
You bought food from a festival and there was change from a fiver!?