McHell Manager here. I have an annoyance that's starting to turn from minor to really bloody annoying: People who use credit/debit cards for their order, and when the transaction is denied for whatever reason, complain to us that they have money on the card.
This happens about once per week. A customer will come in, usually through drive thru, hand us their card, and we get a big message pop up on our screen saying "Transaction not approved." If this happens, I try swiping again, because on an extremely rare occasion it does go through the second time. If both times come up denied, I turn to the customer and tell them the bad news.
Every single time this happens we hear, "Why didn't it go through?!"
I have no bloody idea! Do you really want me to see a message from our register saying "This transaction has not been approved since customer spent $1,251 today and is overdrawn by $137"? Didn't think so. So the only message we see is "Transaction not approved."
"Well try it again!!!" they snap, usually accompanied by a snarl. I inform them that I've already done it a couple of times, and then the complaining kicks in.
"But I just used it at *store*!!!"
"I've been using it all day! Why is it declining with you guys!!!"
"I just paid my credit card bill today!!!"
"I HAVE 11 BILLION DOLLARS ON MY CARD AND HAVE BEEN USING IT ALL DAY! RAWR TAKE MY MONEY EVEN THOUGH I REALLY ONLY HAD A DOLLAR ON IT AND I AM CURRENTLY TRYING TO ORDER $21 WORTH OF FOOOOOOD RAWR!!!"
Inevitably they end up leaving without their food, most of them telling us to "suspend" the transaction until they call the bank/go to an ATM and figure out what's going on. However, my store cannot suspend a transaction; we have to void it out and re-ring it up for them when they "come back" which they never do, because.... wait for it...
Gasp! They have no money!