Almost every person correctly guessed the number on his or her forehead, or was off only by 1! Could this mean that it wasn’t a game we were playing for the first time? Could it be that we’re playing that game over and over every day?
Really? Maybe it's just that, once everyone knows the rules of the game, they are reasonably successful in communicating a tiny piece of information (a single number) to each other.
This demonstrated that by simply deciding to change my own status and acting accordingly, the other person almost immediately granted me that status and at times, changed their own.
That's because he thought he was supposed to, not because it was necessarily something he would normally have done.