It's the day of granddaughter Peaches' birthday party and Mary has ordered Rab to attend sober and on time. Unfortunately Rab is called away on urgent business, i.e. meeting Jamesie in the pub. Jamesie's philandering has finally got him into big trouble and he's about to become a father. This has created a number of small problems for him. Firstly what to call the child and secondly who's going to be the Godfather. And thirdly how to tell his wife Ella. Fortunately Ella takes the news as well as can be expected, and cuts off Jamesie's manhood.
Meanwhile Rab turns up late and drunk at Peaches' party and in a struggle over cutting the birthday cake gets stabbed with the breadknife. Rab and Jamesie end up in adjoining hospital beds. After the doctor tells Jamesie that if his missing organ had been found and kept in the right conditions a re-graft was possible, Jamesie pleads with Rab to find his missing member. In a race against time involving a tupperware container, an ice bucket from the pub and a fight with a very greedy seagull, Rab sets out to save the day.