Even when I'm absolutely furious, I hardly ever show it. Also, I don't really get angry at individuals as much as I do organizations and abstract concepts. When I encounter someone representing a group or idea that I have issues with, one of two things usually happens:
1) I take something so that I don't lose my composure, even when someone or a group of people around me is/are freaking out and making ridiculous, over-the-top threats. My usual comportment has been called "zen" by my peers and "calm and contemplative" by those I'm forced to be under for the time being. Still, under some circumstances I need some help to maintain that demeanor. Once that's been taken care of, I either try to handle the situation diplomatically (which I usually try to get help for) or ignore it if it's not an immediate physical threat to me and there isn't much I can do about it.
2) Sometimes, someone does something stupid and violent. Sometimes it's not even really violent, but invites violence. If that's the case, I usually don;t have time to get my pill bottle and instead just get the hell out of there before I find myself in a truly unfortunate situation. Depending on the nature of the situation, I might go back after the situation's resolved, b***h about it for a few minutes then get back to my day or I might go home and not leave the house for the rest of the day if it's something really scary.
Last time #2 happened, I really scared the s**t out of some people. I got the hell out of the place I was at right as the police showed up and I didn't come back for a few hours. They thought I'd been arrested again, but in reality I was just waiting for the situation to blow over so that I could go back to grab my thermos and laptop then get myself home. I was pissed about if for a long time (as a matter of fact, I'm still pissed about what happened that day and will continue to happen for years to come) but I didn't let anybody see that.