When no one's looking, I focus on an object in the distance and make a cross, then an 'X', then an asterisk. It's a little tic of mine I've had since I was kid. I needed glasses and the doctor told me to exercise my eyes (which is stupid when you think about it) so I did as told and haven't been able to stop since. I have, however, been able to restrain how often I do it. Now I only do it when I'm not conscious of other ppl around me.