One day in her library house saw Twilight practicing magic. Spike was offering encouragement.
"Come on, Twilight. You can do it!"
She steeled herself and concentrated. After a few seconds, Spike grew a mustache and rejoiced.
"Ha ha, it works! Growing magic. That's number 25. 25 different types of tricks and counting. And I think this is the best type of trick so far. Hello, Rarity. What's that? Aw, it's nothin'. Just my awesome mustache. Heh heh."
Twilight interrupted Spike's reverie with, "Sorry, Romeo. As attractive and enticing as you look, it's just for practice, and it's gotta go." The mustache ceased to be, despite Spike's protests. Twilight laughed at his misery.
Aristotle entered the room and asked, "Hey Twilight, you mind giving me a mustache? Might be nice to have."
His request was declined, since Twilight was done with magic for the time being and wanted to take a walk. She was joined by Spike, who was stuck on how talented Twilight was, and Aristotle, who was trying to tell her about his forays into rune-based magic and ritual magic since she had wanted to know if humans could do magic. He had been somewhat successful, though it was limited by shaky hands and sloppy handwriting. Unfortunately for Spike, he was barreled into by Snips and Snails, the frontrunners for the title of "village idiot" that year (and the three previous years' winners for that matter), who were excited about a new unicorn coming to Ponyville reputed to be the most powerful unicorn in the land. The three decided to check out the new unicorn's show.
"Come one, come all! Come and witness the amazing magic of The Great and Powerful Trixie!" A blue unicorn wearing a hat and cape literally burst onto the stage and continued her speech.
"Watch in awe as The Great and Powerful Trixie performs the most spectacular feats of magic ever witnessed by pony eyes!"
Firecrackers exploded to the delight of the crowd, though they disliked Trixie's narcissism. Spike attempted to flirt with Rarity, but realized he had left his mustache at home. Twilight's friends mostly expressed contempt for Trixie's tendency towards grand displays of ability in a manner that made Twilight feel awful.
Trixie noticed the presence of "neigh-sayers in the audience" and challenged anyone to outdo "the most magical unicorn in all of Equestria". Twilight was appointed Most Magical Unicorn by Spike, but she refused to accept the honor, citing personal conflicts that made it impossible to claim the title in good conscience. Meanwhile, Rainbow Dash had goaded Trixie into claiming that she had defeated an Ursa Major with accompanying fireworks. Upon claiming the office of Best Unicorn in Ponyville, Trixie said smugly,"Don't believe The Great and Powerful Trixie? Well then, I hereby challenge you Ponyvillains. Anything you can do, I can do better."
Aristotle was sorely tempted to reference a song he had heard once, but he decided it was better to let Trixie finish what she was saying.
"Any takers? Anyone? Or is Trixie destined to be the greatest equine to have ever lived?"
Twilight was begged to show up Trixie, but she hesitated, even after being called out directly by Trixie to outdo the show mare. Applejack, Rainbow Dash, and Rarity took up the gauntlet, and all were hoist by their own petards in embarrassing fashion.
At one point during the display, Spike, trying to get Twilight to do something, said that "someone with magic of their own" was needed. This gave Aristotle an idea. After Rarity's mane was dyed green and made a literal and metaphorical rats' nest, he approached Trixie, stating simply,"I can do something you can not, Great and Powerful Trixie."
Trixie asked,"What is that, and what are you?"
"I am what is known as a human, though I prefer the term person." Twilight took this time to answer the calls of her laundry, which had recently learned to talk and needed washing rather badly. Trixie said," Yes, Trixie read about you in the newspaper, hooman-"
"That's human!"
"Whatever. What is it you can do that The Great and Powerful Trixie can not?"
Aristotle simply said,"I can stand on two legs as long as I want." He was called upon to prove this, and three hours later, Trixie, having stopped standing on two legs after 15 minutes, decided the only way to outdo the human was to become one. She readied her all-purpose transformation spell, and with two bangs and a slide whistle, the unicorn was gone with a woman in her place.
To Be Continued