For Douglas Peterson and his two 10-year-old golf partners, it had been a memorable round at a world-class course with a caddy who contributed greatly to their enjoyment. For caddy Donald Andrews, the round was among the most challenging, physically and mentally, in which he had participated. As the group walked up the 18th fairway, Peterson reflected on the size of an appropriate tip for the caddy while Andrews wondered how he might influence the size of the tip.