> I immediately arranged a demonstration in which each participant tossed two coins at a target behind his back, without any feedback. I thought the demonstrat

> I immediately arranged a demonstration in which each participant tossed two coins at a target behind his back, without any feedback. I thought the demonstration was going to be to set people in pairs, have one toss a coin and the other punish / scold him every time he didn't come up with tails ;-) That would help make the case that the positive effect of punishment is entirely due to chance.