Purpose: An interactive drill that encourages players to play "pure" volleyball, because the athletes are in the dark about what might end the game.
How it works: Two teams play out normal points. As the coach, you decide what ends the game. You can decide what ends the game: it could be a bad pass, failure to cover the block, a free ball as the third pass. Once you stop the game, have players guess what ended the game. This will result in "unspoken team rules" that will reinforce proper behavior.
Requirements: 10 players, a full court and balls.