My husband and I made a small order - about $7. The cashier repeated the wrong order to us, but I thought she was talking into the mike for the drive-through menu since she didn't make eye contact or wait for us to confirm the order. My husband thought, correctly, that she was repeating our order, so he said "No," but I told him that she was talking into the mike, so he handed over my credit card - we never actually said "yes, that's correct" or anything like that because we didn't think she was talking to us.
When I got the receipt, for $20, I realized she was talking to us and told her the order was wrong. Ok, a miscommunication. It happens - no biggie. However, she was combative from the start and leaned over the window and said to my husband, "Did you or did you not say 'yes' when I asked you if this is your order?" My husband started to explain what happened, but she interrupted and continued to argue with us, raise her voice at us. Finally, she got her manager to void the order and proceeded to yell and insult us, telling the manager that we're crazy, we said yes to the order, we're lying, we're idiots, etc. My husband yelled, "I'm not going to argue with you people anymore. Put the money back on my wife's credit card so we can get the hell out of here." In about 30 seconds after that the manager voided the transaction and apologized, which was nice, but didn't make up for the screaming harpy on the register.