Um, I have this stim when I take a shower. I alternately put my weight on my left leg and a second later put it on my right leg again. Thus, me standing, I kinda rock sideways a little most of the time there.. subsequently making the water splash down on my whole shoulder area. Well, alternately it does. Do this.. for as long as I can remember..
Tadski odd, maybe.. (but I don't care)