There are signs on Japanese trains telling people not to sit with their legs open wide because it is so common for men to sit as if it were imperative that they keep there knees as far apart from each other as a couple of angry, violence-prone weasels. My boss once expressed his frustration with these men by remarking that he'd love to ask them if their testicles were swollen. I am in no way exaggerating when I say that they are sitting to occupy the maximum amount of space possible on crowded trains. Japanese men seem to display this territorial body language much more often than men I've seen in America. Well, it's either the fact that they do it more often or I noticed it a lot more because in the context of the smaller, more densely packed areas of Tokyo, it seems far more inappropriate and selfish behavior.
I won't miss seeing these men who seem to believe they need to stake out a maximum amount of territory with their legs (or who suffer from some odd disorder in the cajones).