I am a student of smileology and have been just about all my life. If you can't smile at something,it's not worth thinking about. Of course, certain things in life are serious, but not that many. Too many people take everything seriously and ruin their life. These are the kind of people I like to be around because they take things so seriously and because of that, the jokes on them.
When I see somebody that looks sad, I have an impulse to try to do something to make them laugh. It is that smile on our face that defines who we are.