Credit Card

I was signing the receipt for my credit card purchase when the clerk noticed that I hadn't 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 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 that signature to the one I signed on the receipt. As luck would have it, they matched.