How about this one?

Oh, wow. by ShatteredSanity on 2012-04-03 06:24:00 UTC Reply

http://www.fanfiction.net/s/7522778/1/Acquaintances_Forgot

This. Explains. EVERYTHING. MLP:FIM/American McGee's Alice

Re: Oh, wow. by firemagic on 2012-04-04 13:18:00 UTC Reply

http://poni.0au.de/story/12047/1/The-Marvelous-Adventures-of-Pinkie-Pie%3A-Crasherdude-Awesome-VS-Mooncloud-Shadowdancer/Pinkie-vs-Crasherdude-vs-Mooncloud

It's just a normal day in Ponyville when Pinkie's Pinkie sense alerts her to an impending Mary Sue fanfiction. Things take a horrifying turn for the worst when Ponyville is invaded by not only not only one of the obnoxious characters but two! Now the very fabric of reality is in danger as the two OC ponies fight for dominance and only Pinkie can save the ... integrity of the fourth wall. We're doomed.

This. Is. Awesome.

Yes. Yes it is. by Shadow on 2012-04-05 01:13:00 UTC Reply

I especially like the bit with the pink shuriken.

Actually, while we're on the subject of cracky goodfic... by HerrWozzeck on 2012-04-04 02:34:00 UTC Reply

...here's an absolutely hilarious parody of Mary Sues I found over in the Hunger Games continuum:

http://www.fanfiction.net/s/7756373/1/

It's called "Mary Sue Always Wins! Especially In HUNGER GAMES!", and I swear I have never laughed harder at fanfiction. I think the best thing about it is that it knows its main character is a Mary Sue, and it just runs with it. And the crazy thing? It's literally spot-on with how it portrays Mary Sues.

There's also ... by Spiegel1 on 2012-04-04 10:54:00 UTC Reply

... this one fic from A.J. Talon of Progress fame:

http://www.fanfiction.net/s/7545374/1/BeatingtheHeat

TVTropes calls it "crack fic in its most delectable form."
How about this one? by Sergio Turbo on 2012-04-04 10:21:00 UTC Reply

http://www.fanfiction.net/s/7349554/1/LyricalChroniclesRedux

Nanoha and Madoka, with Magic Knight Rayheart thrown in it too. Comes with omakes at the end of each chapter.

Some gems from it:

1)
"Oh, I think I have an idea what we can use." Homura mused, glancing at the car behind Miyuki with a bit of a gleam in her eye.

"No..." Miyuki drawled, eyes narrowing. "No." She moved directly in the way of Homura. "I've helped you rip apart broken city property." The Puella Magi continued to approach her. "And you've pulled me out of lots of jams, but no. I'm not going to let you take a car!"

Homura glanced at her, flicking her hair back over her shoulder.

"It has air conditioning."

Miyuki was tempted.

2) From an omake:

Moments later, Yoobey was struck off its perch. Homura, who had just come out of her time stop, furiously began to beat on the Incubator with her flaming golf club.

"How dare you..." Crunch! "Get cooler stuff than our side!" Crunch!

Verdandi, Miyuki, and Hikari all stared at the beat down of the Incubator a bit uncomfortably with large sweat drops on the back of their heads.

"I only get a damn ero-game samurai girl, friendless musketeer, and a beam happy magical girl while you get the effing ***** of Braves? How is this even balanced? I demand a patch to fix this stupid scenario!"

And, yes, Yoobey is not a mini, but another Incubator. Who quickly realized it's better to stay away from Homura. But the best one is seen towards the end. (Too bad the author stopped updating it) Oh, and the "patch" is probably Burning Arisa.

Nanoha. And Homura. Using a borrowed JSDF troop carrier turned into a magical tank (with the help of Mami) to charge at an army of Witches guns (and Devices) blazing. (Oh, and there's Yuuno with them, providing shielding and binding support.)

Cannot find words to describe the awesome.

I have read... by Mister Shoebox on 2012-04-03 20:31:00 UTC Reply

MLP/FALLOUT. MLP/STARGATE. MLP/DRESDEN FILES.

Yet, I can honestly say that THIS is the crackiest thing I have ever seen - thank you, San, for alowing us to enjoy it.

Welcome! (nm) by ShatteredSanity on 2012-04-03 22:49:00 UTC Reply

I've gotta agree with Nesh. by HerrWozzeck on 2012-04-03 19:28:00 UTC Reply

It's actually not that terrible, I don't think. I could see all the characters acting like this, and Celestia's motivation behind... well, that actually makes a certain amount of sense when you think about it. That, and Alice looks relatively IC.

Though, it looks like they were going to continue it, which would've been a good judge for how well the crossover would've worked.

I mean, I am familiar with American McGee's Alice, and it really makes me wonder how this crossover could work. On the one hand, you have MLP, which is a rather bright and cheery continuum.

And on the other hand, American McGee's Alice is... it's actually very grim-dark. Just the art design alone is pretty doggone crazy, but the stuff you see in the game itself gets incredibly creepy. Granted, I have seen grim-dark continua get crossed with MLP before in a context that actually manages to incorporate the tones of both continua without it feeling like there's a jarring tone change, but it's really hard to do right, and I don't know if this fic could manage it.

But it managed that far, so... yeah.
That... by Neshomeh on 2012-04-03 19:17:00 UTC Reply

... is pretty cool, actually! I enjoyed it. Makes me wonder, did the Infernal Train turn up because Alice was there? It is her mind, it makes sense she'd take her insanity with her. Was it the Red Queen's plan all along? Sinister! I'd read more of this if it existed. ^_^

~Neshomeh, who hasn't actually played AMG's Alice, just knows enough to get on with.
I just. . . I don't know anything anymore (nm) by Mysterial on 2012-04-03 15:09:00 UTC Reply
What just... what... by OpinionedAngel on 2012-04-03 13:17:00 UTC Reply

I mean, those two don't even go TOGETHER!
Huh? by the Irish Samurai on 2012-04-03 10:32:00 UTC Reply

OK, I know nothing about MLP or Alice, but even I can sense the wrongness of this!

I'm familiar enough with Alice's Adventures and Looking Glass to know that anything even loosely based off that world will be quite random, but this... it goes so far beyond random I don't even have a word for it.

*has a pegasister friend and an AMA fan friend, so...* by AnnaBee on 2012-04-03 15:44:00 UTC Reply

Basically... this is the darkest, nastiest, most twisted version of the Alice Mythos you can come up with, where everyone's either insane or a victim of the insane serial killers. ALICE is insane, put it that way. The main bad guy of the series, the Red Queen, is the personification of Alice's insanity.

... Crossed over with My Little Pony: Friendship is Magic.

Something tells me that if this was well-written at all, things would end very, very badly for the ponies.

It actually is pretty well written (nm) by ShatteredSanity on 2012-04-03 16:55:00 UTC Reply

Actually, yeah by the Irish Samurai on 2012-04-04 08:14:00 UTC Reply

Having read it again (after seeing all the comments other people were leaving), I'd agree with you.

I still think it's odd that most of the ponies seem to have forgotten, or be unaware of the fact, that they used to live in Wonderland, but the way it's actually written is quite good.

My previous opinion was formed mostly in ignorance; I'll do a bit of research before commenting on something I'm not familiar with next time.
Oops. by AnnaBee on 2012-04-03 18:09:00 UTC Reply

Reading over that post again, I realize I used a wrong word. I said 'was', not 'is'.

I have failed you for the last time.

O_O by AnnaBee on 2012-04-03 07:34:00 UTC Reply

...What.

Makes.

No.

Sense.

My.

BRAIN.