Since I've moved to a big city, I believe it's even more important to do these little things for the people we see every day. At my work as a nanny, we often pass the same street on our walks. One day an old Chinese lady was trying to get her walker up one step and having trouble. It took me all of a few seconds to do it for her and give her a nice smile. Even though she speaks no English, and I speak no Chinese, we have become friends, and always wave to each other when passing.
I agree, this thread is very inspiring. Keep 'em coming, folks!