Fortunately, no questions of this sort have been asked yet. I suppose it will happen sometime, but I have no idea how we should respond. We could simply mark for deletion, but this will only cause the original poster to ask why we did so and argue further.
As a short term member of Physics Forums, I found quite a bit of flame wars between physicists and new users with warped ideas. Topics included optimization questions for their perpetual motion machine that would supposedly make them millions, hollow earth theorists, moon landing conspiracy theorists, and even people who were apparently from the future.
So how can we handle these topics to avoid chaos threads?