
The woman paying was visibly distraught, and kept on saying: "Its a credit card, you don't need authorization". The human nature aspect of her argument was clear when she started defending herself by making it very clear to everybody around her that there is more than enough money in the card and nobody has ever needed to phone for authorization. It was vitally important to her that everyone understood that she had enough money.
She was trying so hard to blame the machine, or the lady behind the till, that she completely lost all sense of reality. She was adamant that a credit card always goes through, and that you never need to phone for authorization. This is the human psyche. She was so concerned that people around her would think that she doesn't have money.