Poor Rue wakes up on the wrong side of the bed. Nothing makes her happy. Even her socks aren't cooperating. When she gets to school all her friends want to play, but she's not in the mood. Instead, she invites everyone to join her in a pout party. 'Absolutely no smiles are allowed!' Unfortunately, everyone thinks Rue's party sound fun and they all come to show off their biggest pouts. In no time at all, everyone is laughing, but will Rue find the humour when all she wants to do is grumble?