Footsies

We had a QCC (Socratic Seminar) in my English class today, and I noticed how people twitch their feet.

Some people did it constantly for the entire hour of QCCing, while others didn't do it at all (as far as I could see) while others still did it every now and then.

I wonder what dictates in a person how often they move their feet. I also wonder, if they were to become self conscious of it, as I was, would they continue to do it?

I wonder how often I do it without realizing it, and scarier than that, what else do I do without realizing it?