I've always been really curious about how and why things work. If something's interesting to me I can't get it out of my mind until I feel I've understood it, and I don't quite get people who just have a "whatever' attitude about the world around them. Not to say that I don't like them; most of my friends are this way.
I'm fairly mellow and don't let little things bother me, but at the same time I have a lot of energy when something excites me. Sometimes I force myself into strange situations just to see what will happen, like pretending I'm just watching someone else doing it in a movie and seeing how it will play out. Some of my friends have called me really ballsy because of this but I think I'm just seeking some excitement.