Watch and see how one player deals with this.
Wow. That guy is a loony! I'd have walked away with a lot of money in that game (in the other guy's shoes).
Why would you choose steal here, if you actually believed he had precommitted to it? There's a decent enough chance he would honor his word. I doubt you would gain much, if anything, from appearing spiteful on TV.
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