Traditionally, Martha and Jas have had a joint birthday party. Martha and Mrs Fitzgerald have up until now led the way in terms of the choice of party theme - characteristically formal. When Jas and her dad suggest 'shaking it up' a bit this year and introducing a Mexican theme, it leads first to the parents falling out and then to Martha and Jas themselves.

Meanwhile, Lily thinks it is time for the three of them to look for new hairstyles. She doggedly tries and fails to create a new hairstyle using a hair donut. As her frustration grows, her friends become more alarmed. They know when Lily loses her temper and goes 'Full Hampton' it can get scary.

In the end, having lost her temper and gone 'Full Hampton', Lily realises she can make amends by holding a party at her house, with a lobster-shaped piñata, to bring her friends back together again.