MiSTings? The Hell?
Consider them "Fanfiction" for the show Mystery Science Theatre 3000.
To do one, you take a story/script/rant and make fun of it, line by line.

Immature? You bet!
Pointless? Yep!
Fun? Oh yeah!

Ah...  I have one.
H.P. Lovecraft's Fungi From Yuggoth
COSMIC TERROR... In the form of goofy poetry. Includes a special short, "The Triumph of Cthulhu."

Wait, now I have two.
Pinky and the Brain: Project X-Scent
Mouse porn. Hey, I don't write 'em...

And three.
Athena Prospects
Star Trek IV it ain't.

Coming Soon:

Movie Script: Hackers

Movie Script: Aliens vs. Predator

Starfox Fanfic: Various Starfox stories

Teenage Mutant Ninja Turtles Fanfic: (Group Misting) Aftermath of the Red Eye