What is the nicest thing a stranger has ever done for you?

I'm sure some people have some crazy stories, but here goes mine. I've always been pretty uncoordinated and bad at sports, and tried out a bunch of them to find one that I was good at. Well, joke was on me because I was really bad at all of them. My parents bought me a few golf lessons at a driving range with a friend, and while waiting for them to pick me up, my friend and I were looking at all of the cool equipment in the pro shop, specifically all the expensive golf balls and their respective packaging. I remember that I couldn't believe that a pack of 3 golf balls could cost over 30 dollars, when a man came up and bought 5 boxes of maxfli balls and gave one to my friend and one to me. I remember thinking that I would be the best golfer now that I had those balls, and kept at golf. I still golf today, have formed a ton of relationships through it, and stayed healthy to boot. I never did use the balls, instead they sit in a pocket in my golf bag, reminding me of the thing that truly got me into the game.