>>10 Toe Rape

That one was deliberately written as a parody of bad fanfic. It's aware of its own crappiness and revels in it, as it exists to spork all other badfic everywhere. The author uses every horrid trope of bad anime fanfic--OOC behavior, ghastly subliterate prose studded with malapropisms and misspellings, a certain lack of detectable plotting--to mock all the badfic on the Internet.

There was a Dragonball Z / Diary of Anne Frank crossover written around 2000 or 2001. It was a crossover, a romance, and eventually an erotic story. The author's grasp of the mechanics of the language is not bad, but a story in which an anime alien martial arts superhero and a real person who actually lived in the 20th Century, who happened to be a very underage girl who died in the Holocaust, have lots of freaky sex, cannot avoid being hideously wrong on multiple levels, even if the prose itself is not bad.

I'm not kidding about this story. Google for it. You will find it. And it will make you want to gouge out your own eyes with a rusty spork. Just knowing that it exists makes me feel vaguely unclean.