Barry Louis Polisar has been making kids laugh for 40 years. What's his secret?

Sit on the floor, the children were told: "Crisscross, applesauce." Listening ears on, everyone. Hands in your lap! (Hands in your lap, Kimmy.)For here on the stage of their very own Mechanicsville Elementary School was a man so renowned that educators call him months in advance, cash at the ready, asking him to please, please come to their school, or their community center, or to the Easter Egg Roll at the White House.