I sometimes escape to a lovely Thai restaurant in the evening for a meal and Jasmine tea.
I was looking through my bank statements to check for something else and noticed by accident that a meal had gone through twice. Took me a couple of days to get the courage to go in and request the money back politely after a deep breath, some people would do this without thinking.
Question is would you go in with no embarrassment? Or am I an utter wimp? They refunded no problem.