I do and I also display other strong emotions such as disgust, surprise etc.
But I also think that I look angry because I _am_ angry.
Anger allows us to increase arousal and helps us focus on an 'obstacle' and programming presents many obstacles.
It's self defeating however, because working in this way is exhausting.
In working with a close friend, who programs much more patiently and methodically, I'm slowly learning to let go of my 'ADD' (Anger Driven Development).
I think I used to consider the slow and steady approach to be plodding, and using my intense approach I really could get a lot of great work done very fast, but after a few burnouts, I had to find another way.
But coding while angry also has another major downside. Anger narrows your focus of attention on what you consider to be the 'threat' or 'obstacle', and anyone who's done technical work knows that the solution is often found by divergent thinking.
Edit: Many people are saying that they only look angry, and that they actually aren't angry. This may be 100% true, but the facial feedback hypothesis suggests that when you make an angry face, your internal state tends towards anger.