Prisoner's Dilemma

You are a criminal. You've just pulled off a heist with another criminal. You've both been apprehended by police, and they explain to you that there isn't yet adequate evidence to convict you both. The district attorney separates you both into isolation rooms and offers you each a choice: to confess or to remain silent. He tells you that if you both remain silent, then you'll each spend one year in jail. If you confess and the other person doesn't, you get off scot-free, while the other person serves four years. If they confess but you don't, then you serve four years while they walk. If you both confess, then you both serve two years.