Idiots At Work

I was signing the receipt for my credit card purchase when the
clerk noticed that I had never signed my name on the back of the
credit card.  She informed me that she could not complete the
transaction unless the card was signed.  When I asked why, she
explained that it was necessary to compare the signature on the
credit card with the signature I just signed on the receipt.
So I signed the credit card in front of her.  She carefully
compared the signature to the one I had just signed on the receipt.
As luck would have it, they matched.