i feel bad that i had to correct an order at a fast food place a lil while ago, it was probably one of the cashier's first days on the job cus she felt bad that she got it wrong and she went to go do something else for a while and a manager took over :(
but to be fair it was really busy at the time and it was probably pretty hard to hear me, i was nice about it and i wasn't in any hurry so i didn't mind the inconvenience