This isn't where I belong. I left all this behind years ago, moved on with my life. But a mare from my past brought me back, and now she won't let me go. So I'm stuck here, trying to make the best of it with ponies that don't understand me, don't even like me. But when something moves in the darkness, and when things go wrong in the cold, dead night, they'll turn to me to try to set things right.

Why? Because once a police pony, always a police pony.
~~
This is a spin-off story to 'Why am I Pinkie Pie?!', and will contain spoilers for that story, but it's not necessary to read that story to understand this one.
Cover art by the talented Conicer
Need more Cinnamon Swirl? Merlos the Mad wrote a fanfic of this story!

There is now a side-story: A Hard Day's Nightmare Night

NOTICE: This is an unofficial and highly expanded story adaptation of the "PWaaMLPfim" Youtube Video Series: Phoenix Wright / My Little Pony FIM - Turnabout Storm! The videos came first, NOT this story!!!!

A quiet summer night in Ponyville takes a violent turn when two pegasus ponies enter the Everfree Forest and only one comes out alive, leaving the second accused of murder, on trial for her life. Ace Attorney Phoenix Wright finds himself dragged from his own world, magically summoned to Equestria by Twilight Sparkle to defend Rainbow Dash from charges of killing Ace Swift, a superstar pegasus athlete and champion racer.

Trapped in an unfamiliar world ruled by magical talking ponies, Phoenix must draw on all his wits and experience to solve the crime and uncover the conspiracy behind it... before Rainbow Dash is banished to the sun for a murder she didn't commit.

Parts 1-43 written by RavenRegios, and edited by Firesight. Parts 38, 42, and 44-epilogue written by Firesight with additional input and prereads from TheGoldCrow, AJ_Aficionado, and Leo Archon.

Ownership transferred to Firesight on 1/15/2018.

Okay let's just go over everything that's happened so far. Dragged into a road trip, check. Dragged to a convention, check. Dragged through dimension. Wait what? Okay, universe. Stop! Seriously what did I do to deserve that last one! Stop throwing me into impossibly horrible situations! It was bad enough being world thrown, but public enemy number 1!? What did I ever do to you!?

Evidently, I must have done a lot. I have been trapped here with nothing but my wit and ingenuity, but I'm still alive and have at least one friend. I decided that it would be better make the most out of my new life, and see if I can live at all in this crazed world of Magic and Myths. Hopefully I won't screw up too badly. I fear what may come if I do. Though.... this is all starting to feel familiar. I'm having some difficulty remembering from where though.
Co-authored from chapter 22 and on with Shinigamisparda

Alt Cover Art
Story inspired by "F**k it, I'm having fun" by JimmytheGrape and everything else in the League of Humans acting Villainous.
Props to them! Cover art is not mine.
Edit*2/13/2014*FEATUREBOXYES!
Edit**4/28/14**Technopathic is amazing and you should thank her greatly for working on new cover art for me. It's not done, but as she does it, I will continue to update my cover.
Edit***5/23/14*** NEW cover art is COMPLETE!
Edit****6/28/14**** Old cover art is back by popular demand

When Twilight Sparkle slipped beneath the covers last night, everything had been fine. She had friends whom she loved, a teacher she adored, and a bright future ahead of her. But when she woke up, her blankets and quilts had been replaced by hospital gowns and padded restraints.

Everything is wrong and nothing makes sense; even her friends have changed. The doctors keep telling her that she is sick, that none of it was real and that it was all in her head. Yet she remembers a life far beyond the hospital walls. She couldn't have made it all up on her own. They must be lying… right?

Ask Asylum Twilight - Still updating regularly!
Equestria Daily
TVTropes
Asylum Fan Group
The Tartarus Project
Russian Translation
The Asylum 20,000 View Spectacular Stage Show!

Art:
Asylum Cover by conicer
Twilight and Twilight Smiles by dreamingnoctis
Mirror Twilight and Plague Doctor by Jaestring / BloodGoldWings
Twilight Smiles and Doctor AJ by conicer
Nurse Ratchet and Silas and What's in the mirror? by Archonix
Doctor AJ Sketch by Archonix | Colored and vectored version by ReFro82
Twilight's Asylum by Khan the Cake Lover
Smilight by HappySwitch
Twilight Waking Up by Dombrus
Fan Art by toxicdemon10
Asylum Twilight by Madness-With-Reason
Asylum Fluttershy and Asylum Ch 26 by Downburst-Backspace
Twilight and her Twin by v747
Birdgirl by sirValter

Readings and Videos:
Asylum Animated Trailer Video by formuladash
Reading by Gammarobot (SugarCubeRadio): All Chapters Here
Reading by Ender Brony: All Chapters Here
Reading by VisualPony: All Chapters Here
Reading by MelancholyIguana: All Chapters Here
Fan Trailer by Kaidan: Asylum FanFic Trailer Cuckoo's Nest

Sanctuary by Kaidan
Broadhoof Files: Dr. Humors by TypewriterError
Broadhoof Files: Corporal Phalanx Spear (Ret.) by Phalanx Spear
A Hearth's Warming Tragedy by Seven Fates

A special thanks to Breath of Plagues, Rex Ivan,
ChudoJogurt, Cynewulf, Death the Kid, Selbi, PrinceDolph, Blahman2816, Queue, and Gage!

Axan Zenith - Dr. Dreamer
Dratini4 - Way Finder
psychicscubadiver - Bright Mind
Velkaden - Dream Chaser
Reese - Silver Glow
Viola Heartstrings - Clover
Archonix - Spinney Whiteacre

A botched viewing spell has sent Twilight Sparkle to Earth and into the care of Kyle West. Having been turned into a human, the local species, Twilight Sparkle relies on her host to help her as she finds a way back to Equestria. And, in the meantime, she decides to learn about humans and the world they live in; the good, the bad, the beautiful and the ugly.

Now With TV Tropes Page!

Princess Twilight Sparkle holds a wake in the memory of Derpy Hooves after a terrible accident tears the mailmare to pieces. This tragedy affects everypony in Ponyville, and close friends preparing for the funeral find themselves coming together in ways they never have before, sharing their deepest feelings, their tender memories, and their most delicate secrets. They even agree to take care of Dinky, fostering Derpy's orphaned daughter into a bright and promising future.

It would all be very noble if Derpy were actually dead.

Cover art by Darkflame
Special Thanks to Props and Warden

You, a young human living in Canterlot, have never fit in with anyone. It's been years since you were found in Equestria, and you've become a small outcast in this world of ponies. Hiding away from everyone, you find solace in another strange being, a weird black bug-like filly that calls herself Chrysalis.

In the aftermath of a huge explosion in the Everfree Forest, Ponyville soon finds itself as the new home for Lucario, an "Aura Pokemon" from another dimension. While he avoids explaining what has happened to him and where he came from, he repays his new friends' kindness by protecting them from the evil forces that suddenly appears around Equestria.

Meanwhile, a certain princess of the night watches his every move, unable to judge if this new visitor will bring safety or utter destruction upon the land.

(This story primarily takes place between season 2 and season 3. Elements from season 3 and beyond may occur, but won't have a significant impact on the plot.)

A young man with a love of military history and MLP:FIM finds himself dragged into Equestria as war threatens the pony nation.

I got the idea for this story from my Civil War book collection and Altoid's Blood and Guts and Ponies story, as it involves a human coming to Equestria to aid in its defense, partly by modernizing it's military and leading its forces on the battlefield.

Just a warning; the main character is Christian and pro-Union. Just to give people a heads up.