Yeah, the incidents do cluster, so try to ride it out. I almost never have trouble with motorists, even though I live in a very car-friendly city. I try to remember that for every JAM, there are at least a thousand--probably more like ten thousand-- who overtake me safely and quietly.
Like Zardhex, I tend to respond in a pretty hostile manner. I don't know why I keep doing this even though I know my hostility usually makes the situation worse rather than better.