Here's another one I've noticed. I like standing with my hands on my hips. I call it the "hero pose," though it can be more casual. I find that I do it when I'm home alone, not trying to communicate with anyone. Maybe while I'm waiting for the toaster or something. I notice other people doing it, too, like when they're in their office or just standing there thinking about something. There's something very comfortable and natural about it, I guess.