My favorite is "knowing how to count change" I am sure everyone is aware of this..... kid at the drive thru tells you your order is $7.61. You hand the kid $10.11 and he has to call a manager to make change.
Well, today..... they "one upped it" (true story) I went to the drive thru at a popular place. At the pay window I handed the girl my debit card. She swiped it once... then again, then handed it back to me telling me the machine won't read it I need to give her another card or pay with cash. (I had no cash on me this time) A little put out (cause I knew how to address the problem) I just handed her another card. Swipe, Swipe.... she handed it back and said it's not reading that one either try another......
At this point I simply said, Just enter the numbers manually.... I got a WTF look followed up with, we cant do that here. I said please check with you manager..... he shows up, tried to swipe the card..... TWICE, Then simply entered the numbers manually. Viola!! She handed me my card and receipt and said Have a nice day sir.