You need chairs (one less than participants) and one pillow.
The players are sitting in a circle on chairs. One player is standing in the center of the circle. The pillow is put on the lap of one of the players sitting.
After the starting signal, the pillow is moved from player to player. It may only be given (not thrown) and always has to rest on the player's laps (except while moving, of course). The direction of the pillow may not be changed.
The player in the middle tries to sit down on the pillow. When he manages to sit on the pillow, the person whose lap the pillow is resting on, is the new player in the middle.