One of the many priceless moments in the 1990 film “Kindergarten Cop” takes place when Detective John Kimble, played by Arnold Schwarzenegger, tries to explain why he is a kindergarten teacher. To a teacher colleague, who is unaware he has entered the school in an undercover role, he explains, “I got tired of teaching teenagers because by the time they came to me I felt there wasn’t much I could do with them. I realized that the real action is in kindergarten.”