I also bite my lips a lot. Usually I chew small strips of dead skin off them. I found a type of lip balm that seems to help a bit yet I do it anyway, just less than I do without balm. On the plus side I have lovely soft lips as a result. On the downside I occasionally chew too much and end up with a bleed. It's never big, but has been noticed by a couple of people at work when it does happen.
My right leg has a mind of it's own sometimes too and it shakes of it's own accord. When I notice I am doing it I can stop it right away and there's no need for me to carry on. Problem is I get the feeling it can take me a very long time to notice it. This does not affect me at work as I am usually either standing or in a sitting job that requires me to use that leg to operate the machinery. It doesn't really affect me when I'm resting either, it's just a little odd.
So that's a couple of my body's weird things. Has anyone actually noticed me doing any of these things? I have no idea if any of it is noticable to anyone but me (aside from when my lip bleeds on rare occasion). Is there anything else I do like that I haven't realised? Does anyone have the slightest idea what causes these or are they just very strange habits?