A strange thing has been going on for a while. For some reason, when I'm sitting around doing nothing, I'll start tracing curse words in the air with my finger, one letter over another. Over and over. Sometimes a combination of them that makes no sense. I'll realize I'm doing it, and stop. Soon enough, though, I'm doing it again. It's not really noticeable from a third-person perspective since the motion hardly looks like writing, but my mind knows exactly what it's spelling out.
Why curse words? I have no idea, but I guess this is what you'd call a stim. I've done it with my right foot, too.
I just thought I'd post about this strange behavior and see if anyone relates at all. I've come to find it quite annoying, myself.