There is an American Express commercial with Jerry Seinfeld, where he is using the AE card to buy gas. The main point is that with cash, it is a pain if you "oversqueeze" and go over an exact dollar amount. Seinfeld pumps to exactly $20.00 with one squeeze, then dramatically oversqueezes to $20.37; however, he is not fazed, because he has the AE card.
Contributed by alert reader Tim Vaughan.