Darrell Davis wrote in to Reader's Digest with a funny story about his son Stephen. Stephen was a firm believer in a non-violent ethic of living, so it took the Davis' by surprise when their son chose to fulfill his college physical education credits with a course in tae kwon do.

Stephen's partner in the class was a gentle young Japanese woman named Maki. Maki also believed in the non-violent ethic, so she and Stephen worked well together. They learned as little martial arts as was necessary to pass the class.

On the day of their final exam, Stephen and Maki faced each other for a demonstration of tae kwon do moves. Suddenly, Maki threw Stephen to the floor and pummeled him with some perfectly executed kicks and punches.

Stephen demanded to know what Maki was doing. In her gentle manner…