Some examples of this is where I've chosen to pay for someone's lunch ahead of me in the queue. Another example is when I bought a phone for a homeless guy and subsequently became friends. He needed a phone to get help through the council but also I had no way of knowing where he was or how he was doing without a phone, and one evening when I expected to see him at 7pm I couldn't find him anywhere until 3am where I found him asleep, it was then I realised I needed to buy a phone for him. I think it was only around £30 and he was very grateful, I in turn got only immense satisfaction knowing I had helped and I could contact him to see how he's getting on.