I know what's been bugging me.
Space.
Not the black, endless, UFO-and-I-don't-know-what-else-there-is kind of space.
But my space.
I am fine with people coming into my space. I can just save a corner for you and we'll be all fine and get on with our lives.
And if you don't come into my space, all the more I have no reason to complain. It doesn't matter to me and I don't care.
But you coming in and out of my space. Pace a little. Sit for a while. That bugs me. Quite a bit. I have to shift my stuff around. And yet there is no reason to leave a permanent space for you. That's quite irritating.
If you know what I mean.
Answer: Self preservation.