Background: Last year I was fourteen and lived with my grandpa in California for a year. When I wasn't at school or at home on the computer, I would be working at his locksmith shop as an "apprentice." He paid for everything and took me to and from school, so I gladly worked for free.
Story: My grandpa had just got done helping a soldier in the national guard: he needed to get copies of his keys as he was going to be away for several months and had someone watching his house.
As I was cutting his keys, two 16 or 17 year olds walked in. They needed a bike lock so they could go surfing and take their bikes. As I was cutting the keys and my grandpa was around the corner answering the phone, the teens decided to grab a few things off of a huge board out front that has tons of key and lock accessories.
They hid the accessories in their towels, and put the bike lock on the counter. The soldier noticed and walked up behind them. After they had paid for the bike lock and started walking away, the soldier started yelling at them asking if they were going to pay for the things in their towels. The teens immediately dropped everything and ran.
The soldier got his keys for free, as it was only $20 for the 8 keys. Way cheaper than the things he kept the teens from stealing, and it only cost us a couple dollars.
So I am the manager of a cell phone store, and this is around the Christmas season, so money is tight for a lot of people.
We have an insurance program where you pay a monthly charge, then if you need to use the insurance you pay a fraction of the full price of the phone and get another sent to you. Depending on the phone it can range from $50-$200.
I'm working with a lady who happened to come in and had a broken phone. Well it wasn't broken, mostly it was waterlogged from being put in the washing machine for a little bit. It was a sweet little old lady who wanted to talk to her grandkids for Christmas and take pictures. Unfortunately the phone was a goner, too damaged to function or salvage.
I told the lady as much as a gentleman walked in the door and just wandered around a little. I told him I would be with him soon and he nodded. I finished explaining the options to the lady, who was not very happy about the situation, as essentially I had told her that there was nothing we could do and that she was going to be without a phone for Christmas. She said she didn't have the money for an insurance replacement (around $150), so she left nearly in tears.
She was sitting in her car in the parking lot of the store, and the gentleman who was in the store asked what happened with her. I explained the situation, and he nodded and said he would be right back. After stepping outside and talking to the woman for a minute or so, they both walk back in. The gentleman hands me his credit card, and says he's going to take care of whatever it would cost to get her another phone.
It was extremely heartening that a random stranger would do something like that with no expectations for reward. Especially around the holiday season.