When Hubert Prentiss refuses to pick-up after himself, Mrs. Piggle-Wiggle refuses to argue with him, but Hubert soon begins to understand Mrs. Piggle-Wiggle's rules as he finds himself trapped in his room under a pile of toys.
All the children love Mrs. Piggle-Wiggle and she loves them, and even better, she knows exactly what to do to get rid of their bad manners. So when Hubert Prentiss won't pick up his toys, Mrs. Piggle-Wiggle knows that the only cure for him is to just let those toys pile up - until Hubert can't get out of his room!