It was raining hopelessly yesterday as I was walking towards Borivali station. Unprepared for rain, I was trying to walk past people, dashing from below one umbrella to another umbrella. And then one guy just said I could walk the few metres under his umbrella - a perfect stranger, under no obligation to share his umbrella. I hadn't even asked him. I had just ducked my head under his umbrella, hoping to pass on to the next in a few seconds, but he let me walk with him. I reached the station, thanked him and went my way.
I don't know his name, nor do I know anything about him. Just that he was nice to me when I needed niceness.
I guess this is the best way to thank him!