Pip and Posy are best friends - they love to play, and make things, and have fun. But just occasionally they get cross or sad, and sometimes things go wrong that are beyond their control. And that's when kindness, sympathy - and resourcefulness - make everything better. In 'The Birthday Party', it's Posy's big day and she's delighted with Pip's present of a beautiful toy bus. The friends have fun with the bus, then play some energetic party games and, before long, it's time for the birthday tea. But just as Pip is carrying the magnificent birthday cake to the table, he trips over the bus and flies into the air - along with Posy's cake!