Put a pretty plate in a big box. Place the box in the center of the room. Set a hammer on the box. Participants have the obligation to break the plate but they have to break it secretly, so that nobody will know who is responsible. The box is checked periodically (by the entire group). The exercise continues for as long as the plate is intact. When it is discovered that the plate is broken participants use a ouija board to consult each other who broke the plate. #ॐ