Zoidberg's claim is very suspicious to me. The roleclaim is, quite obviously, false, but the claim that it was a ploy against the mafia is just off. If I were to attempt the same move, I'd definitely pick a better role. And then I'd defend myself better, and for longer. Zoidberg gave out far too easily.

However, I can't see how this would be useful to the mafia. Surely they wouldn't make so dodgy a move? I think Zoidberg is just a really unimaginative townie with a busy RL.