Yesterday too, I had someone who didn't understand the concept of wait time.
They had come to my counter and given me a faulty $50 (a full inch of the edge had been entirely ripped off). I couldn't accept it and while I was speaking to the managers like he asked... this (I don't like using taunts but it's apt this time) Neanderthal of a guy couldn't understand that the managers were still convening to discuss said $50.
Instead, he kept knocking at the glass and the counter to get my attention, and repeating the same thing "What does your manager say about this?"
Me: "They're discussing it still, sir and will be with you shortly."
I had to keep getting up and assuring him that they were in fact, discussing it.
In the end management couldn't accept the bill and they offered him a discount that wouldn't require the $50.