Magic Kindergarten: The school many young unicorns in Canterlot attend if they want to learn the fundamentals of magic. Unfortunately, for a young filly named Twilight Sparkle, quite a bit of the experience is tears, pain, and humiliation.
She breaks down in tears one day, and is seen by none other than Princess Celestia, who lifts her sagging morale.
This story is a short, sweet moment of the past between two characters when they scarcely knew each other.