Fanfiction is a good one. I always like seeing fanfiction outside its ghetto, where it never occurs to anyone to call it that.

I helped pre-read a Library of Babel My Little Pony crossover fanfic. I noticed that Wikipedia had a section that filled most of a page listing Library of Babel fanfiction without ever referring to it as such.

And I might as well mention, Alicorn wrote a short story called Earthfic where stories taking place in the real world had such a ghetto. I'm pretty sure it was just making fun of the fanfiction ghetto, but it applies pretty much as well to all of them.