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The act of mentioning any potential fanfic's plot, whether sexual or not, will cause that fanfic to come into being in a publicly accessible location.
Robert: God, can you imagine a story where Jean-Luc Picard and Twilight Sparkle went on an adventure together?

Jean: Stop! Don't invoke Rule 235-- damn it, that story's on fimfiction.net now. "Discord's Prime Directive."

Robert: I'm so sorry.
by Chatterbox O'Toole October 11, 2012