The UK game show titled Golden Balls is a perfect real world example of the prisoners dilemma. During the final round of the game each player must choose either to split the money with the opposing player or steal the money for themselves. If each player chooses to steal, both individuals go home with nothing. If one individual chooses split and the other chooses steal, the person that picked steal takes 100% of the money for himself/herself. If both players choose split, the amount of money is split 50, 50. The payoff matrix in this game has three Nash Equilibrium points that are present where at least one person choose to steal. This matrix makes the split option very questionable for players because they have nothing to gain as long as the other player is planning on stealing.
Overall really interesting game show. Here is a clip that illustrates my explanation a little better.