(N.) A story plot which is so outlandish, the reader might be persuaded that the author was on crack. If actually written, rather than simply speculated upon, will almost always result in crackfic. What sometimes happens when an author throws the plotbunnies a carrot.
Author 1: *explains story idea in great detail*
Author 2: Dude, you're not really gonna write that, are you? It's a freaking crackplot, people will think you're insane.