Nazi Theory of Internet
The theory that, no matter on what forum, if something mildly controversial comes up, Nazis will eventually be brought up as a counterpoint, and discussed.
"The court ruled that the 4th-grader passing out Jesus fliers was ok."
"I bet they would have ruled differently if she'd been passing out Nazi fliers."
"Yeah, because Jesus and Hitler are totally the same."
"Jeez, the Nazi Theory of Internet really surfaced fast on this one."