DON'T touch someone's arm or stand too close to someone.
DO keep your hands and arms at your sides when standing or keep them loosely folded on your lap when sitting.
DON'T put your hands in your pockets, on your hips, or cross your arms in front of you.
DON'T yawn without covering your mouth, bite your nails, spit, chew with your mouth open, audibly sniffle, or pick your nose.