I found this to be a very interesting method of dealing with a modified Prisoner's Dilemma. In this situation, if both players cooperate they split a cash prize, but if one defects he gets the entire prize. The difference from the normal prisoner's dilemma is that if both defect, neither gets anything, so a player gains nothing by defecting if he knows his opponent will defect; he merely has the option to hurt him out of spite. Watch and see how one player deals with this.
http://www.youtube.com/watch?v=S0qjK3TWZE8
And then your opponent still steals, gets all the money, and nothing goes to medical research. woopty doo.
No, Romeo chooses steal. If his opponent also chooses steal (in spite of Romeo's credible commitment to choosing steal himself), the opponent does not get any money.