Pinkie Pie woke up again. However, as she looked around the room she was in, she realized that she was back in her underground room in Sugarcube Corner.

“It was all a bad dream!” Pinkie Pie thought to herself, relieved that the mental hospital and the crimes she had allegedly committed were nothing more than a dystopian nightmare.

However, her calmness was shattered by the sounds of painful feminine moaning coming from her closet across the room.

“Sweet Celestia! What is that!” she thought to herself as her eyes shot wide open. For several minutes the silence of the night would be shattered by the occasional heart stopping moaning from the closet.
Reaching into her nightstand, she picked up the knife that she kept there. While violent crime was practically non-existent in Equestria, she had taken the precaution of providing herself with the means to protect herself should she ever have to face an intruder.
Going over to the light switch, Pinkie Pie turned on the lights in her room before turning to face the source of the mysterious noises. Slowly approaching the closet, she steeled herself for whatever might be waiting in there for her. Throwing open the door she prepared to stab the intruder. However what she found in there was much worse.
Sitting blindfolded with her mouth gagged and her hooves tied together was her friend, Rainbow Dash. Pinkie let out a yelp when she saw the cuts and bruises across her friend's body. Then to her horror, she saw that Dashie’s iconic cutie mark had been cut off.
The sound of Pinkie’s scream caused Rainbow Dash to suddenly panic and begin frantically thrashing around, her head and body slamming into the sides of the wardrobe.
“Relax it’s me, Pinkie Pie!” said the pink pony.
This attempt as reassurance caused Rainbow Dash to begin panicking even further. Pinkie Pie, being the good friend that she was, hopped on top of her friend and pinned her down in order to prevent Dashie from hurting herself even further. As soon as she got Dashie to stop thrashing around, Pinkie proceeded to life blindfold from Dashie’s eyes.
Staring back at her were two bloodshot and terror filled eyes, the pupils at the center of them smaller than a pinhead. Seeking desperately to find out what was the matter with Rainbow Dash, Pinkie reached behind her head and untied the cloth gag that suppressed her muffles.
“Please don’t hurt me,” begged the Dashie, her whole demeanor submissive and scared, a far cry from her otherwise boastful and cheery personality
Shocked by Rainbow Dash’s fear of her, Pinkie asked, “Why would you ever think that I would hurt you?”
“If you’re going to kill me, just get it over with already. Have some basic modicum of mercy.”
“Dash! Snap out of it! I never have and never will hurt you!” said Pinkie as she swiftly untied the knots that were wrapped around Dash’s legs.
“What has gotten a hold of Rainbow Dash!” thought Pinkie Pie herself. As soon as she got Dashie unbound she would do some sleuthing to find out who had hurt her friend.
However, she would never get that opportunity. As soon as the ropes around Rainbow Dash’s legs were untied, she swung forward and headbutted Pinkie Pie. This sudden attack sent Pinkie flying backwards, dazed and confused. Seeing Rainbow Dash jump up into the air, Pinkie instantly knew that Dash was about to come down hard on her. Rolling on her side, Pinkie was barely able to avoid getting hit in the head by Dash’s hoof. Looking over her shoulder, she saw that Dash’s foot had smashed through the floorboard of her room.
Turning to the stairs, Pinkie run as fast as she could, desperate to avoid the wrath of her murderous friend turned fiend. Suddenly she went flying sideways as Rainbow Dash bucked her in the ribcage. Gasping for breath, Pinkie Pie begged for mercy as Rainbow Dash set upon her, pinning her down as she repeatedly beat Pinkie in the face.
“Why-punch -are- punch- you- punch-doing this!” asked Pinkie Pie as she began to taste her own blood in her mouth.
“Don’t play innocent with me! You know full well why!” yelled Rainbow Dash, a vengeful, murderous glint visible in her eyes.
Suddenly Pinkie remembered what had happened over the past couple of weeks. She shivered as she remembered all of the cruel torture sessions she had forced her prisoner Rainbow Dash to go through. She remembered the muffled screams as she had electrocuted her friend and cut off her cutie mark. Deep down she had enjoyed it, her sadistic tendencies winning out over her kindhearted personality.
She refused to believe that it had been her. “It must have been somepony else!” she thought to herself, refusing to accept responsibility for the terror Rainbow Dash had experienced. “I’m a good person? Right-” she thought to herself.
A split second later Rainbow Dash’s hoof came smashing down, delivering a final, lethal blow to the psychotic pink party pony.