One of the kindest things that a stranger has done for me was when my fiance and I were driving on a big toll road in Illinois, headed back to Chicago. Anyway, we were pulling up to pay our toll and my fiance was about to hand the clerk the money when the clerk said that the car ahead of us had paid for us. We were so shocked (I know, it's not really a "big" thing) but no one in Chicago ever did that for us.
Another instance was when I was working for the city last summer, and a homeless man was coming towards me. Now, I wasn't alone so I wasn't scared or anything, I thought maybe he was going to ask for some money. But he didn't; he asked me if I had seen any cans or bottles that he could collect. Then he asked me how the night was going...and to make it short, I will always remember what he told me. "We just keep on chugging along.." I don't know; coming from a homeless man, that just really "spoke" to me. I hear it from other people but who knows what this man has been through.
I do not meet people like this all the time but when I do - wow, my perspective shifts.