A friend just got done working out at the gym, was driving home through L.A. and noticed his gas gauge was on "Empty". So he pulled into a Circle K to get some gas realizing he forgot his credit cards and only had a $5 bill. So he handed the 5 to the cashier and asked for $5 worth of gas. The cashier farted, grinned, and handed him a receipt. Moral of the story: American Express - don't leave home with out it!