Learned the "Smith System" one day on "Safety Day" working for the subsidiary company of a large petroleum outfit. Also had to learn and demonstrate CPR. When one of the old guys was blowing up the doll he had to quit with a puzzled face and when we asked him if he was ok all he could say was "My DAMN teeth are coming out!"---his dentures! I laughed so hard I nearly pissed myself and nearly a candidate for CPR myself!