Ponyville, Equestria

7:30 am

Spike knew something wasn't normal. It was pretty obvious when he woke up in the middle of the night- too early for him, he might add- and the light was still on downstairs.

As he walked down the stairs, he heard zapping sounds. That in itself was pretty weird, but then he jumped back. A bolt of magic had zipped by him, almost hitting him. Spike sighed, and facepalmed.

"Twilight?! What are you doing?!" he shouted. "Why are you up this early?"

"Oh, hi, Spike!" Twilight said, stopping her magic frenzy. "I was just testing new spells I found in my old books." She levitated a book over to Spike. He took it, and read the title.

"Advanced Unicorn Magic for Dummies? Isn't that not possible or something?" Spike asked. Twilight rolled her eyes.

"You silly. It's fine!" She took the book back and read through it. "Ooh! This one looks good!" Twilight showed Spike the spell. Again, Spike took it from her and read it out loud.

"'Body Swap Spell?' Twilight, are you sure? Who would be crazy enough to help you test it?" Spike asked, then looked at Twilight, who was smiling at him. "No. Don't you dare. I am NOT swapping bodies with you. Forget it."

"Come on, Spike! For science!" Twilight said, following Spike around the library as he started cleaning up books lying on the ground. "It'll be a scientific breakthrough! And a magic breakthrough! Also, think of the possibilities!"

Spike rolled his eyes, and decided to humor Twilight. "What possibilities do you mean?"

"Like, for example, if you swapped bodies with me, you'd be a pony! That means you could be the same size as Rarity, and you'd get to hang out with her a lot..." Twilight trailed off, smiling.

"That would be nice..." Spike mused, then shook his head. What was he thinking? "Twilight, it doesn't matter. You forgot one thing: I'd be you. And I'd be a mare. Do you know how awkward a relationship with ANYPONY who was ALSO a mare would be?!"

Twilight grinned sheepishly. "Well... yeah. Oops."

"Besides, I'm not doing the spell anyway. Find another test subject," Spike said, then started back up the stairs. "I'm going back to bed."

As he passed the window, almost to his bedroom, Twilight's horn glowed. Spike barely had time to think Uh-oh and duck before the beam of hot pink magic shot past him, almost hitting the tip of his scales. The spell hit the window and broke it, flying out of the library on its way to hit Celestia-knows-what.

Twilight blinked, and made an "oops" face, and Spike got up off the floor. Looking through the window, he noticed that it was heading toward Sweet Apple Acres.

"Twilight...?" Spike said, nervously. "I think you just majorly screwed up."

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Sweet Apple Acres

7:45 am

Applejack yawned, waking up. She had been up for a while (thanks, rooster!), but she was still really tired. Maybe she shouldn't have gone to that party last night.

It wasn't long before she heard the sound of something streaking towards her. It sounded like some sort of firework, but who in their right mind was shooting off fireworks at 7:45 in the morning? They'd have Mayor Mare on their plot in 10 seconds flat.

"Apple Bloom? Big Mac?" Applejack called. Her brother and sister, who weren't far away, came running.

"What is it, AJ?" Apple Bloom asked, looking up at her big sis. Applejack pointed at the comet-like object, that seemed to be getting closer.

"Any idea what that may be?" Applejack asked her, and Apple Bloom looked up before shaking her head.

"Big Mac? Do you know?" The two ponies looked at him, and he shook his head.

"Nope." Big Mac, true to form, didn't say much.

The comet seemed to be getting closer and closer. It got so close, that Applejack began to notice certain things. Certain things like it wasn't a comet at all... it was more like a bolt... a hot pink bolt of energy...

Applejack gasped. "Everypony scatter!" she cried, but it was almost too late when she said it. By the time everypony registered what she had said, it was too late. Applejack staggered backwards, half-blinded by the light, and noticed her siblings experiencing the same effects. Calling out to them, Applejack stretched out her hoof, then her eyes closed, and all went black.

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"Ugh..."

Applejack slowly blinked open her eyes. She looked around quickly, but the comet thing had vanished. Odd. She opened her eyes all the way and the first thing she realized was that she was lying on her back.

The second thing she realized was a bit more weird.

"What the ever-b***in' hay is goin' on?!" she screamed, upon realizing that 1) the entire lower half of her body was red, not orange, and 2) that she was apparentally part stallion.

"I... I could ask the same thing." Applejack turned, and almost did a spit-take. Talking to her right at this minute was...her? She could hardly believe it. Applejack went up to her doppelganger and, on an impulse, poked her in the face.

"Ack! What the hay was that for?!" the mare in front of her said.

"Sorry..." Applejack said back. "I guess I had to make sure that you were, well... real."

"Is this real?" the mare asked.

"Eeyup."

A third pony had spoken, and Applejack knew without a doubt that it was Big Mac. "Big Mac, stop playin'jokes on us with that filly-like voice. You're not foolin' anypony." Applejack looked down, and there was... Apple Bloom?

"Uh..." Applejack turned and looked at her doppelganger again. "Apple Bloom? Is that you?" The mare simply nodded, then bent down to the pony who right now was a red-maned filly.

"Big Mac? That you?" Apple Bloom said to her doppelganger, who nodded. He- she?- looked up at Applejack, who simply nodded before a word was spoken.

"Yep. I'm Applejack." Applejack said. "And the first thing I'd like to know is, HOW IN THE HAY DID THIS HAPPEN TO US?!"

Author's Note

Applejack, there is a filly present. She may look like you, but still!

Just something to (maybe) clear up:

1) This takes place in the Golden Oaks Library, but Twilight's castle is not canon yet. So, mid-season 4.
2) Twilight was not swapped because she would have had to cast a spell beforehand that would've included her in the swap, but she forgot.