Pinkie was always a very happy pony. She had lots of friends and seemed to not have a care in the world. Always smiling no matter the situation, always the light hearted one ready to give someone who was in the deep end of life a lift. This was the outlook of the bubblegum mare to anyone around her. Everyone wished they would have her life, throwing parties everyday and eating as many sweets as she could. Maybe they would change their minds about that if they knew her true story.
She never liked to lie. It had to be her least favourite thing to do. Always telling Pinkie promises, nopony would ever think she would tell a very big lie. But in order to forget, she had to tell the lie about her cutie mark to the crusaders. She started to believe the lie herself, until gradually, she convinced herself that was how the story went; her parents never kicked her out. Her mother never threw things at her. They had a big party, and that was that. But Pinkie still had a small part of her that whispered in her mind;
That's a lie, and you know it, Pinkie.
Of course, Pinkie pushed back that thought. She was in denial and nothing could change that. But keeping this deep secret mixed with her overreacting personality made her slowly go insane.
The Cakes started to notice something...off, about Pinkie. Sometimes she stared off in the distance, not blinking. Sometimes she stopped breathing, and they had to dump water on her just to get her to snap out of it. There was many incidents when she spoke very rapidly, her thoughts racing about, couldn't stop moving, or acted very aggressive. She even had her own imaginary friend whom she called Gummy that she had hallucinated. He was a very large friendly alligator with no teeth, and her closet friend. The only friend she ever had who she could share all her feelings with, and also whom she named her pet alligator after later on. She remembered when they later took her and Gummy to a psychologist, who diagnosed her with bipolar disorder.
Pinkie remembered when she heard the news. She had no idea what it meant, as Mr. and Mrs. Cake never told her about mental diseases or anything terrible in this world. Pinkie hated it as a young mare, but was now very grateful she could hold on to her innocence for a while. As she sat on the white surgical bed, Pinkie remembered listening to the conversation with confusion. Pinkie had never been very good at remembering things, but to this day, she remembered a few tidbits at the news that changed her life.
"Put her on perscription...."
"Our therapy is cost free, Ma'am..."
"I'll need you to fill out these forms..."
But most of all, she remembered Mrs. Cake sobbing the entire time, with Mr. Cake comforting her. Mrs. Cake apologizing to Pinkie, insisting it was all her fault, that she should have raised her better.
"What's going on, Gummy?"
"I don't know, Pinkie. Something bad, Mrs. Cake looks upset."
"I don't like it when ponies are sad. It makes me sad."
"It's okay, Pinkie." The final thing that happened before they left for home was her hugging Gummy as tightly as she could.
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From then on, Mrs. and Mr. Cake treated her much differently. Mr. Cake seemed uncomfortable and stiff around her, while Mrs. Cake was very overprotective. She wouldn't let the teenage Pinkie work or go outside, or watch television that was over PG. She never punished her, but Pinkie still luckily grew up to be a more or less good pony.
She remembered when Mrs. Cake would put a strange white powder, which she later learned was ground up pills, in her drinks. She walked in one day, asking her what it was.
"Sugar, Pinkie Pie," the icing-maned mare replied, talking to Pinkie like she was five years old. Pinkie had always hated it. When she asked Mrs. Cake to stop talking to her like that, she stopped for a while, but started again pretty soon.
"Oh," she responded quietly, looking at the drink. It didn't smell or taste much like sugar, but she supposed it was a different kind. Now that she thought of it, Mrs. Cake did look quite nervous when Pinkie had asked.
About two weeks after the doctor's appointment, Pinkie remembered Gummy slowly dissappearing. She had grieved for him like a lost friend, which he was. She remembered sitting in her room sobbing, and when she told her adoptive mother, she remembered Mrs. Cake being extra nice to her, also seeming a little guilty. Pinkie hadn't noticed this, not until she found the pill bottle in the pantry.
Pinkie wanted to make a party for Gummy, even if he was dead. A good-bye party. She was looking in the pantry for sugar for the cupcakes, when she remembered Mrs. Cake taking out the sugar for her drinks in a certain part. If she keeps the yucky sugar in here, Pinkie thought, Maybe the regular kind goes in here too.
It made sense, the Cakes always being so organized with where they put the certain food items. She had opened the wooden pink frosted pantry to find a big bag of the ground up pills. But something was strange. It said, "PINKIE'S" on it. Why was it especially for her? She decided Mrs. Cake didn't like that type but thought she did, so dismissed it and kept looking. But what she dug out, was a pill bottle right next to the bag. The pills on the front of the bottle were the same colour as the powder she had in her drinks. She looked behind it and read the label.
Take one gram a day. Reccomended to grind up and put in food for younger ponies.
Pinkie stared in disbelief as she put two and two together. She smashed the empty bottle on the floor. She started cursing Celestia's name as loud as she could. She almost wanted Celestia to hear. She wanted the whole town to.
"Pinkamena Diane Pie! What is going ON?" Mrs. Cake had skidded into the kitchen, face pale.
"LIAR! YOU BIG LIAR!" Pinkie grabbed the pill bottle and threw it at Mrs. Cake. "WHY DIDN'T YOU TELL ME? WHY?"
Mrs. Cake looked down at the pill bottle and started sobbing again. "Pinkie, I-"
"LIAR!" she shrieked, running out of the house. As she ran, she could see confused ponies in the dining part of Sugar Cube Corner, and was surrounded by ponies who were staring at her, angry tears running down her face. She kept running, until she fell over in a big mess of tears. She cried until she fell asleep on the floor of an abandoned wood.