John Moody drives around Britain's cities in a Black Cab picking up customers. While this may sound like an interesting idea for a docu-soap type programme, this is not the end of the story.Cash Cab is a gameshow. When the unwitting contestants step into the cab, thinking they're about to fork out a tenner for a trip down the road, they are instead greeted by flashing lights, screaming sirens and quizmaster come taxi driver John Moody. He explains to them the simple concept: He asks them questions, they get money for getting them right. Get three wrong before they reach their destination and they get booted out, win no money; but they don't have to pay the fare, so that's nice. If they get to their destination without losing all their lives they leave the cab with a healthy wad of cash, smiles on their faces, and a 15 minute stint on one of the most original and quirky gameshows in a long time.