Let's look in on the Coopers... This evening they're entertaining George's boss, Mr Atterbury and his wife Iris. Dinner is over and the group are now in the living room discussing what a wonderful meal Liz prepared for them. Mr Atterbury ate a whopping 17 oysters! He's even got a joke to accompany the oysters, about a mermaid, but Iris won't let him tell it. So Liz decides that she'll try to tell one instead, but she's not very good at telling jokes...