There are so many I would have to think on the nicest. One I remember right now. I was driving back home from visiting my folks who lived 45 minutes from me at the time. Rene' was a toddler and Alicia was in an infant seat.

I blew a tire on the freeway but managed to pull off on a wide section of the off-ramp that was out of traffic.

A young man pulled over and changed the tire for me. I was so thankful as I was scared to death. I didn't have any money to give him as a thanks, which he said he wouldn't take, handed me his card and left. After I got home, I read the card and it said his name along with "no phone" "no address". I think he looked for ways to help people and had those cards made up because he wouldn't take anything for helping.

That's the first one that came to mind and my heart is warming again just remembering.