I'm typically pretty private. It takes a bit for me to open up beyond superficial things. On the other hand, I'm also fairly open about just about anything you might want to ask me. Obviously, those two statements contradict each other, but it's the truth.
I tend to be quiet, as I like to observe and listen, but if the right subject comes up, it's hard to shut me up. While I'm usually shy and quiet, I'm also outgoing and gregarious, in the right setting. More contradiction.
I like to feel like the smartest guy in the room, for better or worse. I'm usually pretty level-headed and logical. I like having the answers to whatever the question is.