[Ichneumon]

Wanna have a fun time? Next time you're in a restaurant with someone, quietly and slowly, while in conversation, start pushing or putting things, like the salt/pepper shakers, the posy vase, etc - over the halfway line onto their side of the table. Watch them start to fidget and get more and more uncomfortable - You are 'intruding' on their invisible demarcation line ...it's called "territorial imperatives" -

I'd be willing to bet that their "fidgeting" and discomfort had less to do with any "territorial imperatives" than it did with their rising concern that they were seated at a table with someone who was obviously playing some passive-aggressive game, or who was so tightly wound that he couldn't stand to have objects on his side of the table and might snap at any moment.

[A knight without armor]

I know I'm a whole lot more careful with people in public nowadays. I've always tried to be polite but now I find myself profusely apologizing for brushing up against someone on the subway, etc. I've seen regular looking people go off just incredibly over the slightest real or imagined transgression. The last thing I'd do is engage in a little power game with anyone out there. I like to get home in one piece.