The box game is best played with alcohol.
The idea is to reach down and pick up a plain cardboard box using just one's teeth. After each round the box is made shorter, until it is little more than a cardboard tray lying on the ground.
The final stages of the game demand increasingly extreme contortions of the body. The margin for error shrinks and very quickly people begin to fall.
When one loses balance, it is very hard to maintain a controlled composure for the camera. The reflexes snap. Every thought and effort is redirected into not getting hurt. It is in this moment all pretense slips away and a more truthful, dynamic picture emerges.