Fan Fic on crack. The easiest type of fanfic to write, and one of the hardest to write well.
Crack Fic is not merely humorous. In fact in many cases it doesn't have to be humorous. While it is similar to Alternate Universe Fic, in that they both change some fundamental aspect of the source material, the "something's different about this" idea is taken to the extreme. In its broadest sense, Crack [...] [tvtropes.org]