How do you handle righteous anger situations? I never handle them very well, I usually either

a) Walk away and analyse the situation from every angle for a long time afterwards, determining the perfect response etc and being annoyed at myself for saying nothing.
b) Get really really really ( way too ) angry and start swearing and threatening way out of proportion to the incident.

What I wish I could do is calmly tell the person exactly what they did wrong and exactly how I feel. I really admire people who can do that, but I never feel I can defend my position against a seasoned agitator ( ie nasty person with plenty of practice in arguments ).