I've recently been doing a lot of people watching and I've noticed that some people have a pleasant disposition pretty much all the time. Others almost look as if cracking a smile would make them throw up. I realize that it would look goofy to walk around cheesing it up all the time, but there are more ways to smile than just by showing your pearly whites.
As I've been doing this non-scientific study, I've also realized that not everyone knows how to show emotion. Why is it so hard to be excited on the outside when you are excited on the inside? Come on people, if you're excited, tell your face to get excited. Otherwise, you just look like a lame-o.