Bob is arrested for being over the limit whilst driving home and taken to the police station, where he meets Terry, who has been arrested for fighting at a football match. As Bob is scared that he will lose his licence, Terry agrees to change identities with him for the blood test. Bob subsequently spends a night in the cells (as Terry), and then appears in court and is fined. Just when they are celebrating the success of their swap, Bob realises that Terry had also been drinking the previous evening and the blood sample he gave (as Bob) is even more likely to prove over the limit.
—don @ minifie-1