I'm not sure I think random acts of kindness is suitable material for a competition, but I'll share some of mine:
You can read about one, here:
http://www.photo.net/bboard/q-and-a-fetch-msg?msg_id=00DPXh
Also, when I see couples (out on a beach, or at a nice mountain overlook, etc.) floundering to take a picture of themselves together against the nice background, for a souvenir, I stop to take their pictures.
When I won a knife of a kind I already had in one of Jerry Busse's contests on this forum, I gave it to the person who came in second, because he didn't have any, yet.
When I'm taking the train, I help the elderly up the big step, helping them board the train. I also help the elderly carry their luggage.
When people stop me to ask me technical questions about photography (happens constantly when you are out in public with serious photo gear), I try to answer their questions.
I stop for every dog and cat I come across, and give it a good rub, until it's thoroughly pleased.
I save the lives of innumerable butterflies, starfish, wild bird chicks, etc., from over-zealous tourists.
I am involved with a charity which photographs orphans, to help them get placed with families, and photographs the elderly and infirm, to help them get placed with long-term care-takers.
I offer free use of some spiffy nature pics to natural history organizations and nature conservation organizations.
I share a friendly smile and conversation with those who are down on their luck.
I carry out as much litter as I can carry from the wilderness, almost every day.
I'm sure there's a lot more, but that's all I can come up with, right now.
Cheers,
Mike