Better Living Through Science and Ponies is a crossoverFan Fic between My Little Pony: Friendship Is Magic and Portal.The story picks up where the single-player campaign of Portal 2 ends, with Chell on the surface wondering what comes next and GLaDOS prepping Atlas and P-Body for co-op testing. Unfortunately, a malfunctioning portal gun (which Wheatley had previously "repaired" with duct tape) creates an "uber-portal" that pulls the entire Enrichment Center, Chell included, into another dimension... namely, Equestria.Chell, now transformed into a pony, manages to meet up and befriend some of the locals, and quickly settles into life in Ponyville. But her new home is threatened when GLaDOS turns her cyclopic eye on studying the ponies, and using them as test subjects...It can be read here (deviantART), here (Equestria Daily) or here (FiMFiction.net).A Portal 2 mod was being devolped, although unfortunately, the project is currently in a state of indefinite cryo-stasis and in need of new members. Anyone familiar with Source and is able to help should contact them. Their blog can be found here.
This fic contains the following tropes:
Actress Allusion: Caroline's last name was never given in the game, but this story mentions it as McLain, the same as her voice actress.
Air Vent Passageway: Chell uses some vents to get back inside the Enrichment Center. Justified in that her small pony body fits better.
Ascended Fanboy: The author. His work started out as a fanfic, and now it's getting its own Portal 2 mod.
Breaking Speech: GLaDOS uses her brain-scanning technology to pick up on the ponies' insecurities (such as Rainbow Dash's fear of failure, Rarity's obession with her appearance, and Pinkie Pie's fears of being abandoned by her friends) and prey on them, in the name of "psychological stress-testing".
Berserk Button: Ditzy Doo (aka Derpy) is the only test pony to not break under GLaDOS's taunts, until GLaDOS insults her daughter Dinky.
Dual Wielding: Or rather, Quad Wielding. GLaDOS develops portal guns modified to be used on pony legs that also double as long-fall boots. Chell equips herself with one on each leg when she goes to rescue the ponies from the Enrichment Center.
Fisher Kingdom: ANYTHING that is sufficiently intelligent is turned into a pony upon entering Equestria, even GLaDOS, Atlas and P-Body, who aren't human-like at all.
GLaDOS: Wa..war....warning. Warning, destination universe imposing critical changes to basic structure of both organic and inorganic systems. Changes occurring primarily in hardware, minor changes detected in data... physical change is resulting in... oh you’ve GOT to be kidding me.
Flanderization: GLaDOS is uncharacteristically bloodthirsty, as opposed to merely sarcastic and passive-aggressive. But given this is the third time Chell has tried to kill her, it could be chalked up to a form of Villainous Breakdown.
I Was Told There Would Be Cake: GLaDOS once again promises a cake and party to test subjects as a reward for surviving her tests. For once this works as Pinkie Pie resolves to finish her test extra quick to get some.
Jossed: The first chapter now has a note explaining how it was written before Derpy became canon.
GLaDOS had no reason to test Pinkie Pie in particular. Her usual promise of cake would've made her the best test subject ever, but GLaDOS just wouldn't be GLaDOS if she didn't totally break her spirit.
Mythology Gag: While Celestia systematically trolls GlaDOS, GlaDOS shows her 'body' to her... And, in a fit of comic irony, Celestia calls the computer fat. Yes, one of the two most common insults used by GlaDOS against Chell is fired back at her. GlaDOS's response is glorious, and it only gets better from there.
One-Winged Angel: GLaDOS pulls this when Chell confronts her, using a robotic body based off of Celestia's. She was going to make it human, but she said she realized 'she doesn't like them very much', and when in Equestria.
Pity the Kidnapper: Celestia realizes, after her first conversation with GLaDOS, that righteous indignation only amuses the evil AI. She immediately changes tack and verbally judo-masters GLaDOS into leaving her alone in her test chamber — GLaDOS has a great deal of trouble dealing with perceptive test subjects, especially those who can talk back.
Villainous Breakdown: "SHUT UP. SHUT UP. SHUT UP. UP THE SHUT. I WILL KILL YOU RIGHT NOW IF YOU DON'T SHUT UP."
Power Limiter: GLaDOS designs devices that inhibit unicorns' magical abilities and prevents pegasi from using their wings. The first of these is apparently powerful enough to render even Celestia and Luna (mostly) helpless.
Sequel Hook: Atlas and P-body pulling GLaDOS' custom-made body out of the destroyed Enrichment Center, with her claiming there is more testing to do and that she was still alive.
Word Of God states that this is because GLaDOS never dies.
Shout Out: When GLaDOS was giving Pinkie Pie her Break the Cutie moment, she states that the only reason her friends were there was because they were worried she is only a few steps away from becoming a serial killer. One who bakes her victims into cupcakes.
She also claims Pinkie's diet is going to give her diabetes, which is from Bitter Sweet.
She also accuses Fluttershy of being the kind of person who could snap and burn someone's house down, a nod to a fanfic called "Hell Hath No Fury" where Fluttershy does just that.
Silent Protagonist: Chell, naturally. Given more of an explanation that she has no vocal cords as they were removed, most likely by GLaDOS, for "science". This gets averted at the end, thanks to a gift from Luna - a necklace that turns Chell's thoughts into speech.
Waxing Lyrical: GLaDOS' final lines are a variation of her "Still Alive" song.
GLaDOS: Life has been giving me lemons... and by letting you go I tried to make lemonade. A simple, sweet answer. Now... now I’m going to take life’s lemons, turn them into combustible lemons, and then burn you alive with them. Just like Cave Johnson would do... now that was a smart human.”
You Are Fat: Given who's doing the taunt, this was a gimmie. Amusingly, Celestia turns this back on her, it seems to stick later. When GLaDOS reveals her Winged Unicorn battle body, Chell thinks it looks thin to be somewhat anorexic.