In the NarutoPeggy Sue fanfic "Again", Haku is described as being an innuendo magnet since any conversation or situation that Haku is part of almost invariably sounds innuendo-filled to everyone else, and it appears to be contagious...
In Bramblepool, a Literature/Warriorcats fic, Brambleclaw fights his romantic rival:
He fantasised while Crowfeather struggled beneath his paws.
In Stay By Me Hugo tells Brian to hide in the bedroom when Joan comes home.
Clop It: After Celestia has given the group 'Royal Re-Sexualization Gadgets' we get this simply marvelous exchange.
Twilight: So why did you give me one?
Celestia': Twilight, your friends are all fags. It’s only a matter of time until they try to turn you too, and you’ll need something to defend yourself.
Twilight: So what should I do... use it to try to beat them off? Of me?
Curse Of The Demon Pony: Early on Twilight remarks that she set up a few booby traps in her room to keep her brother out of her "bits". This sounds reallycreepy, even if you're aware of the fact that "bits" means "money" in the show.
Dave Stdider Pokemon Traner: Chapter 13's title, "STEAMY SEX! WITH GOSTBUSTERS!" is an example of this. Yes, this chapter has a sex scene. No, the Ghostbusters are NOT INVOLVED WITH IT. They're just in the chapter. That's what the "WITH GOSTBUSTERS" means. They are not being sexed up in this chapter.
From Moon Daughter, quite a few involving a misspelling of "horse":
"Some wild hores ran over the hill."
"It ran away and I chased it faster, it was a thrill chase, that hore would be mine!"
"Do you notice something weird about these hores," Said Albaster suspiciously.
"This is a secret hore of Artemis" I diclared.
Whether it's actually accidental depends on whether My Immortal actually is a parody or not, but regular words are occasionally "accidentally" spelled wrong and turned into obscenities, e.g. "Minister of Magic Cornelius Fudge" becomes "Mystery of Magic Cornelia Fuck", "Professor Slughorn" becoming "Professor Slutborn", etc.
"Breasts" are often used unintentionally, in many different contexts. In The Evil Gods Part 1, the author talks about corpses being eaten by "foul breasts" (beasts). In Threat of Satanic Commonism, the heroes meet with the "head breast" (priest) of Moscow, and in The Titans Strike Back, Draco and his mob kill some "false breasts" who try to stop him from killing the British royal family.
In The Evil Gods Part 2, our heroes go to "Washing Dick", and get some "boobs" from witches.
In The Titans Strike Back, we hear it's a co-story with Attack of the Spank (Sphinx).
The summary of the Harry Potter fic Rushing by maxfaith reads thusly: "The night before Ginny leaves for her last year at Hogwarts, Harry learns that happiness is no longer beyond his reach, but held tightly in his hand." It's Ginny's hand, not his penis.
The So Bad, It's GoodRedwall fanfic Soulless Shell is loaded with this. Perhaps worst is the bit where Leif attacks a rapist with the words "Now feel the pain that so many innocent young girls like her have felt but with oh so much more intensity". Disregarding his impressive lung capacity, what the hell is he doing with those magical knives?
Then again, see the Literature folder for why that's about the only part of the fanfic that's reasonably authentic.Also see the MST:
Romsca: (shuddering) I've 'ad just about enough o' this. Does this author even know wot 'e's sayin?
Lyulf: Lessee wot we got so far... 'e seemed like a paedophile, 'e's already in bed wid 'is mum, 'e did unspeakable things ter Arnold, Rajh is his secret gay lover...
Ara: ...and now he's necrophilic towards his dad. Lovely. I don't think even Freud could have thought that one up.
In Star Kits Prophecy, after it is remarked that it is StarGleam's second time out hunting, we get this gem: "she'd had her first time when she was a littlekit and she and FireStar had snuck out together that's why he chose her as his apprentice_." Squick.