There are four players involved in this game, representing two persons.
In the middle of the stage there is a wall. Two players will always stand behind the wall, so that they cannot be seen by the audience while the other two players are playing.
The host asks the audience for two rooms in a building, e. g. bathroom and living room or children's room and attic. The area to the left of the wall represents one room, the area to the right of the wall represents the other.
Two players (the other two are standing behind the wall) start their game in one of the rooms. After the scene is established, one or both of them switches to the other room. They walk behind the wall, stop there and are replaced by the other player who is "responsible" for the other side and who comes out on the other side of the wall. The game always changes between rooms individually or in pairs, the more often the better, because the game lives on that. Important: the same player on the same page always remains responsible for the person he or she plays! It is important to have no breaks, i. e. the moment a player disappears behind the wall on one side, his "alter ego" must come out on the other side with the same pace, facial expression and posture. Important are frequent changes of side / room with original postures and movements, otherwise it is not funny.
The "wall" can also be a two-metre-long piece of black fabric, which is attached to a wooden pole and hangs down from the ceiling (or rod).
It is played without a wall. The left or right edge of the stage has the function of a "wall". So if a player goes to the right (out), his alter ego comes on the left side of the stage and vice versa.