When I was in high school, I went on a camping trip with some of the girls from church and our leaders. We loaded into my parents' station wagon and headed north to somewhere in New Hampshire.
On the way home, I realized that we were going to run out of gas. We stopped at a gas station to fill up and then realized that no one had thought to bring cash, not even the adults. Credit cards weren't an option either.
Somehow I managed to convince the gas station attendant to let us put enough gas in the car to get home, and I promised to put a check in the mail that very day.
We either looked very trustworthy or so pitiful after a night of camping that he was willing to write off the cost of gas to help us out.
I mailed a check that very day.