Cold Calling
For many years starting in 1990, I worked as secretary to Arthur R. Miller, a renowned professor at HLS. He used to have me bring him a fresh cup of coffee halfway through his 1L civil procedure class (I think it was mostly a prop; he never had finished the cup he'd brought with him when the class started). If he was talking when I entered the room, I walked right in and gave him the new cup. If a student was talking, I didn't move until he or she had finished...