Do you have any physical quirks/nervous habits??
...little things you do a lot with your hands, feet, head or any other body part? I was in a meeting today and one of my coworkers cracked his neck, which he does a lot. Sometimes he'll just tilt his head to do it; other times he'll grab his jaw and twist it. It makes a loud crunch, o_O. Some people crack their backs or their knuckles. I chew on the inside of my lip, and I'm constantly rubbing my nose (I'm so afraid of having boogers).
What do you do?