Sounds like I have some new things to read, if I'm ever overcome with morbid curiosity. Which is quite often, sadly.

Well, I have read a lot of bad fanfic before. Sadly, the worst I have ever read no longer exists. Here is the basic rundown:

A Red and Black Alicorn OC (tm) becomes such after making a deal with the Devil. No, not some pony Devil, our Devil. He broke through the Fourth Wall, and came to our world, summoned Satan, and became a demon. Sort of. In reality, he has a demon trapped in his hooves. No, this is not a metaphor. It is quite literally trapped in his hooves.

So, now with a massive gash in time and space, religion comes to Equestria. Satanism and Christianity to be precise. Absolutely no other religions come over. At all. Now because of Christanity coming to Equestria, same sex marriage is banned in most places except Ponyville. Because. Reasons. Also, modern military weapons and tactics come to Equestria and they are now at war with:
a. griffons
b. changelings
c. another pony race

If you guessed a, NO DUH! It's always the griffons!

So, Gary Stu is a Modern Major General, who threatens to gut people with his katana if they misbehave. He is the most skilled swordsman ever in pony history. His katana was his cutie mark before his deal with the devil. Now it has 666 behind it.

Oh, this is all just beginning though! Turns out Pinkie is possessed by a demon. You get one guess as for what demon!Pinkie does. If it was anything other then make Cupecakes, you do not know MLP badfic. Turns out, ponies know she kills ponies and makes them into baked goods! It's OK! That's. Just. Pinkie!

No, let me rant some more. Those three words are used everywhere. Gary Stu hunts down Pinkamena, but most ponies don't see it as demonic possession. They see it as Pinkie just being Pinkie! Yep, crazy Pinkie Pie, always throwing parties, making balloons appear out of nowhere, and killing ponies to eat! That's just her, you know!?

And Gary Stu, oh, Gary Stu has the seventh Element of Harmony. Whoda think, there was another one. Turns out, element number seven, the mission element that represents an aspect of Friendship amongst others? DARKNESS! Because that's what we need!

This fic is one of the worst, on so many levels. The Stu is so OP he makes Rose Potter look weak, the religion bashing is over the top, almost every character is OOC, and it tries so hard to be funny but it just FAILS!

Reading back over this, this is just a huge rambling rant on my part. I am going to leave it the way it is. I hate this fic. Yet, at the same time, I wish it was still around. It was perfect mission material, and not because of how much I hate it. I saw so many gags, moments for character interaction, exploring how Pinkamena could exist after the Cupcakes mission, just... So many wonderful things to mission in here. But now, it is gone. I still have a copy. Perhaps, if I get very bored, I might mission it anyway, for myself. It is such a shame you all will never be able to read the worst fic I ever read:

Pinkamena, the Pink Shadow.

For I have never read anything truly horrific or disgusting, that wasn't intended to be.

I've read confusing ones, like My Immortal and HHHHHHHHHHHHHHHHHHHHHHHHHHHHHH, but nothing that was just soul-sucking "Oh my god, who would DO this!?" bad.

I take the Legendary Badfic warnings at face value. The most masochistic I get is playing stupidly hard video games. And eating food so spicy that I temporarily lose my sense of taste.

Basically Cupcakes, but with Gravity Falls characters.

There's a rather infuriating Doctor Who one I'm planning on tackling for my next mission. Basically, when Rose looks into the Time Vortex, the TARDIS turns her into a Time Lady and the Doctor's "bonded mate". Three guesses what they had to do to complete the bond.

I've read so many. I mean, I think we can all agree that My Immortal wins the award for worst on a technical level, y'know SPaG and stuff, but I think Sweet Apple Massacre is the one that made me cringe the most. I'm not linking it, because that would require to go look for it again, but a short synopsis is that it's a MLP fic where Big Mac does VERY BAD THINGS to the Cutie Mark Crusaders.

I believe I've mentioned before that I well and truly loathe MLP shockfics, as they're incredibly pointless and don't really exist for any reason other than to offend people.

101 Days of Blueblood is a shockfic, but it's also so unbelievably long and so unbelievably boring...

Link goes to a riff. Don't even give this author views.
https://docs.google.com/document/d/17KWJx-qiwe5rzAgk2ZHoIK5BNclOm_6B8ah17VTZ8yk/edit

It may be a troll fic, but the author is WAY to good at making it bad:

http://narutoveangancerevelaitons.blogspot.com/?zx=8681a488cfd2db77

https://www.fanfiction.net/s/6254959/1/Memoirs-of-an-OC-Outsider-Character
Here's this. I've never fully read it because It's 41 chapters and that, to me, seems too long. Also the author of this fic wastes two chapters to explain her fic (uses a big chunk of it to defend her oc) and to explain the Japanese words she uses, both of those chapters were unnecessary.

...let's just say that I've got hideously gruesome plans for, well... this.

There's a reason the link goes to the TV Tropes article. Read it... if you dare. >;)

TSAB: Downfall.

God. That fic just drives me incoherent with rage. It's almost blatantly some guy who thinks that because the Nanoha-verse has themes about friendship and understanding your enemies it's lame and needs to be EDGIER.

Fun fact, I actually wrote the execution to that fic right after I finished reading it, on a bus, in the Notes app of an iPhone, in like an hour. And I pretty much never write scenes out of order, I was just that angry.