I was driving from Sacramento to Reno, and there was a bad snowfall up in the mountains. I ended up getting struck in a small country town, and couldn't get up an iced hill. I thought I was going to be stuck there the entire day (at least), but a stranger pulled up in their pickup truck—with four wheel drive—and towed me up the hill and to safety. That's the most significant act of kindness I can remember—from a complete stranger.