The pirate captain leads you to the back of their ship, where there's a table set up. He reaches into his pocket and rolls a pair of dice, then hands them to you. "This is how it's going to work," he says. "You roll the dice, and if they land as a six, then we're even. But if they end up as anything else... You give me your wallet." For some reason, this doesn't feel like a wise gamble. You don't have much of an idea what the chances are that he'll win or lose so you decide to walk away before he notices what's in your pocket.