Spam-fics, originally known as Silly-fics and now generally referred to as Omake, are generally short stories designed to provoke a response. In many cases they are a way that a writer can explore a story concept or character pairing without any expectations on the part of the reader. They focus on one concept, "what if Ranma was a potato" for example, and play that out. In some cases they are used to "shock" the reader by having some bizarre or completely unexpected twist at the end.
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