I have to drive on a two lane highway to pretty much get anywhere relevant where I live. And since I live in Colorado, we have a bunch of shitty drivers who speed recklessly everywhere. So whenever I see someone speeding at a ridiculous speed I try get beside a car in the other lane and drive at the same speed as them to effectively block the road so they are forced to go slower since they can't pass by. Bonus points if the person I'm driving to the side of is actually going at the speed limit instead of speeding like everyone else. I don't know if this makes me a dick or not but it's really satisfying.