Via Cheap Talk: the Prisoner’s dilemma as a game show.
Quick analysis: it’s not truly a prisoner’s dilemma, as when my opponent chooses to defect (steal), I get $0 no matter what. Also, from the sound of things, it seems as though the guy had defected in a previous round, which leads to a good point: defection begets defection in a rational strategy, so long as an exit option is not available (and in which case, defection begets exit).