When visiting the Grand Canyon, in the USA, I took the opportunity to join a guided, overnight hike down to the bottom of the Canyon. While water is usually available from taps along the route, there was a problem at this particular time, so we had to carry our own with us. It was thus a very precious commodity!
On the way back up the next day, I was almost at the top when I met a woman who had slipped on the loose gravel, grazing her knee and hand. She was feeling very miserable, as she had only just started her hike and had a long way still to go. I had some plasters in my back pack, so I stopped to help her, using some of my precious water to clean her wounds before putting the plasters on. This little bit of attention really cheered her up, and she was able to continue her hike in a much better frame of mind.
Sometimes, even the smallest gesture can make a really big difference.