One morning about a year ago, I was drinking coffee in my Brooklyn apartment when there was a knock on the door. My wife had left for the day and we were not expecting any deliveries, so I was naturally perturbed by the disturbance to such a sacred morning ritual. Like most New Yorkers, I contain that paradox of being openly friendly to strangers, while holding any waste of my time in utter contempt. It’s the same trait that leads us to yield to a pedestrian with a pleasant w