When Celestia needs to take a month long break in order to acclimate her sister to modern times, she offers the place of Regent to the one she feels most qualified to handle the duties, her faithful student, Twilight Sparkle.

Unfortunately, Twilight doesn't thing she's qualified, and in her ensuing panic she suggests they put an ad in the paper, as if being Regent were any other job.

It was a stupid idea, but when Princess Luna jumps on it, the three of them become a panel of judges as the most qualified (or least qualified, they weren't very specific) ponies in Equestria try to convince them that they're the right ponies for the throne. Watch as Twilight quizzes prospective rulers with bits of historical trivia, Luna witness the insanity that is modern Equestria, and Celestia almost tear her mane out in a moments of pure frustration.