In a world of perfect harmony and joy there will always be ponies who begin to feel used to it. They begin to stop feeling the specialness of life because it is no longer… special. There are ponies who they pay to make them sad, and those overly happy ponies go home with a new appreciation of joy. Sad making was usually a good business in the more prosperous city, and Sad Makers usually had friends or other Sad Makers

The problem is, one sad is all alone.