A delivery man whose route took him by a doughnut shop everyday always stopped in for some doughnuts. During a yearly physical his doctor told him he must go on a diet and give up all fattening foods. For days he passed by the doughnut shop without stopping for his much loved doughnuts. One day, as he was getting ready to head home from his job, a fellow worker asked him how he was managing without his daily doughnuts. He replied, “Well, I’ve been doing pretty good so far but today I was really craving some. I said to myself that if I passed by the shop and there was no parking space immediately in front of it I would not stop and, sure enough, six times around the block there it was.”