I bite my nails (which most in this thread seem to do already), I incessantly drum on tables and things with my fingers, I crack my knuckles, toes and back all the time (pretty loudly, too), when I'm walking on a sidewalk/tiled floor I try not to step on any cracks or lines, I play with my hair (which is strange, considering I'm a guy with short hair), I procrastinate too much, I'm constantly looking for a clock to tell the time, and I always go up staircases two steps at a time
I didn't realize I had so many bad habits