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! All small children will enjoy finding out what happens next - and seeing how Pip and Posy make the best of a very, very sticky situation.