Troper's Law
From Tv Tropes
- "As a trope page discussion grows longer, the probability of a comparison involving Wikipedia approaches one."
A common cry among TV Tropes traditionalists is "We Are Not Wikipedia!" This invokes a slippery slope fallacy that implies that any change to the wiki will lead to TV Tropes losing its "character" and becoming Serious Business. Of course, Wikipedia has a different mission in mind, so such a comparison is moot. Besides, when was the last time you heard a Wikipedian claim "We Are Not TV Tropes"? (Since you asked, July, 2009). Lesser used, typically as a response, is "We Are Not 4chan!" (or Encyclopedia Dramatica, though there are voices saying Fast Freddie inspired TV Tropes from it; he denies it banningly), implying a descent into chaotic snarkiness.
A subset of Godwin's Law, and just like that one, invoking this law means the person in question automatically loses the discussion.