I read a similar story in, I think Reader's Digest? Anyhow, here's the story, as close as I can remember: the last one to board a particular flight was a young man, and he was going to have to be bumped, because there were no volunteers, and the logic was, last one on, first one bumped. When he heard that, he gasped and started sobbing into his hands.
He explained quietly to the flight attendant that he was trying to get home for a short military leave. As it was, he'd only have something like 12 hours with his family, and now it would be down to 8 hours.
The attendant explained the situation to the cabin, and then asked again for a volunteer to be bumped, or else the soldier would be.
Everyone in the cabin raised their hand.