I smiled back, the importance of manners, my mother always said, is inversely related to how inclined one is to use them, or, in other words, sometimes politeness is all that stands between oneself and madness. Nicole Krauss
A slowly moving queue does not move uniformly. Rather, waves of motion pass down the queue. The frequency and amplitude of these waves is inversely related to the speed at which the queue is served. Anthony Stafford Beer