A story lovingly ripped off from the Futurama episode of the same name.

Twilight gathers the girls to her basement to reveal her latest invention. Unfortunately, they get distracted by another of her inventions: the 'What If" machine, a device capable of answering any 'what if' question posed to it. Follow along as the mane six discover the improbable scenarios that could have been their lives.

When Doctor Brownian Motion hears that a filly in Ponyville has found a way to catch cutie pox and a zebra has the cure, he's determined to find a way to make a version of the disease with all the benefits, but none of the harmful side effects by speaking to those involved and experimenting on himself. Surely nothing can go wrong?

Luna has had enough of Celestia's games, and has found the perfect means of revenge. Using a long-forbidden spell, she transforms her sister into little more than a small filly, all so she could pull the greatest prank ever. Unfortunately, she soon learns that before you fool around with dangerous magic, you really need to read the fine print...

A sequel can be found here.

What wouldn't I do for Mother?

What wouldn't I do for Love?

... What would I do if I had to choose?

((For the purposes of this fanfic, the episodes "Cutie Mark Chronicles" and "Hearts' and Hooves' Day" take place after "A Canterlot Wedding."))

'Unseen and unheard: They must never know'.

That's the motto of the CMAA, the Cutie Mark Allocation Agency. Nopony knows who they are or what they do, but they're vital to the workings of Equestrian society.

This is the story of two of these unsung heroes of the pony world, who selflessly sacrifice their time and energy for those blasted mysterious cutie marks that the ponies seem to like so much.

(Thanks to Zemious for the excellent cover picture for this story!)

Cloud Kicker might just have the wildest life of any pony in Equestria. That may just be why Princess Luna wants Twilight Sparkle to study the insanity that is Cloud Kicker's life for a sociology report. Unfortunately for Twilight Sparkle, she is going to have to survive the circle of jealous friends, paramours, enemies, crazy co-workers and disappointed family members that surround this crazy pony. Will Twilight Sparkle be able to complete this assignment before it spins out of control, or will she be reduced to a neurotic mess?

A Winningverse Story.

When you know somepony is guilty, but you can't prove it, what do you do? If you're Princess Luna, you let the guilty ponies decide. Based off the mind game 'The Prisoner's Dilemma'.

I always wanted to go to Equestria. When I got the chance, I took the deal without reading the fine print. To my surprise, I didn't arrive there as a pony, or even as a human. It seems I get to view this world from a different perspective than what I've imagined.

My name is Echo. I am a Diamond Dog.

-Edited by the one, the only, Nathan Traveler!
-(Cover by Jovial_Shake of fimfiction.net)
-Now featured on Equestriadaily.com!

This story is a sequel to The Three Sisters

What if... After "The Three Sisters" Rarity managed to find Chrysalis and talk to her?

A definite sequel.

Now with a TV Tropes page! Warning: will contain spoilers.

What are the chances your favorite pony was secretly a changeling all along?

Yeah, probably about one in one.