My boss told me the following story:
This past weekend there was a big snowstorm and the aftermath of it was tons of very slick spots of ice all over the roads. My boss was driving to a friend's house and, in order to avoid a car that was turning into her lane, she ended up skidding and getting stuck in a snow drift. She tried to get out of the drift, but her wheels just kept spinning without her car moving.
As she was despairing, a truck drove up and the driver, a total stranger, got out of his car. He pulled on boots and a big pair of gloves and got a shovel out of his car. He walked over and asked if he could help. My boss, of course, accepted. This man shoveled out her car and then helped her maneuver to get out of the snow drift she was in. Without asking for any kind of thanks, he then got into his truck and drove off. She was certainly thankful for his help!