Choose one person to be the ghost. Everyone else closes their eyes and
stands very still, listening for the ghost. The ghost walks around the room,
standing behind the silent players. When the ghost is behind someone, the ghost
counts slowly (and silently in their mind) to ten. If the person the ghost is
behind does not say "is there a ghost behind me?" before the ghost finishes counting,
the ghost tells them they are dead and they are out of the game.
If that person does in fact say those words then they join the ghost and try to
eliminate the rest of the players. If everyone gets eliminated then the
ghost wins. Otherwise the last persons who becomes a ghost wins.
(Many thanks to Penny for this terrific game idea.)