Split

Pinkie paced around her room. "Hey look Gummy. The pegasi made a storm today." She said to her pet alligator. She stared out of the window to a deserted city. Everyone went inside.

Suddenly, she heard a knock at her door. Pinkie trotted over and opened it. In the doorway was Twilight Sparkle.

"Hello Pinkie. I heard you felt under the weather. I brought you some cupcakes."

Suddenly, the dizziness came again she collapsed to the floor. When she came to, she saw Twilight blinking  violently, a bewildered look on her face.

"Pinkie, are you not telling me something?" Twilight managed to spit out. Pinkie cocked her head. She looked past Twilight at a mirror in her room and saw that pony with the flat pink mane.  The mare smiled evilly and giggled, a crazy look in her eye. Who are you? I'm you silly! But how? You-you can't be me! I wouldn't say those things! Not to my friends! Oh Pinkie, don't you remember me? The little filly on the rock farm, who never smiled, until you pushed me away to make room for rainbows and parties? Oh, and friends?No! Pinkie didn't notice that Twilight left, scribbling down noted madly on a notepad.

Twilight ran to meet her friends, scribbling down her observations on her notepad. She ran to the library to meet the concerned faces of Applejack, Rarity, and Fluttershy. They leaned in as Twilight began to speak.

"Well, I went to see Pinkie." Twilight declared.

"And, how is she? Poor little darling is out of her mind!" Rarity exclaimed dramatically.

"She said that this place was horrible and that she'd rather go back to the rock farm than have to deal with us. But I noticed that she collapsed in a dizzy fit, and her mane seemed to be flatter than usual. Then when her mane poofed up a bit, she had no idea what she had just said. Then she kept staring at something, like she was in some sort of trance."

"So what are ya saying, sugar cube? What in tarnation is wrong with 'er?" Applejack asks.

"I don't know, all this evidence points to one thing. Remember when we threw a surprise party for her? She had the flat mane and a crazy look in her eyes, like she went insane when she thought we didn't think she was our friend. But when we showed her she was, she was, well, Pinkie again."

"So I think I get it, if its okay to intrude," Fluttershy said softly. Twilight nods, and she continues," Maybe Pinkie thinks we're ignoring her, so I think we need to spend more time with her."

"You spoke my mind Fluttershy. But before we go, we need to speak to someone!" Twilight and her friends rushed out and headed toward the Everfree Forest