When you're in prison, whoever ends up with the shellfish will lose. It's the game all prisoners play. It's like keep away from the shellfish. And if you end up with the shellfish BZZZZTT that's it, you're the loser.
If you lose, you're a fool (ふ). All you had to do was not hold the prison shellfish. It really shouldn't have been that hard to not lose, ya fool.