One of them has built a rocket, and managed to go up a little way and survive coming down, in an effort to prove that the earth is flat.
There is also a nutter who thinks that, based on his observation of a shadow, the Earth's axis of rotation is now a lot more inclined than it was. Strangely, when I pointed out to him that Polaris still stayed in the same position all the time, so the axis must still be pointing at it, my comment didn't get published on his website. http://www.divulgence.net/ for anyone interested.