Do Atlas-related conspiracy theories count?
I believe that the entire Update (or at least most of it, he may actually be as morbidly obese and morally repulsive as he presents himself as being) is a hoax by BushOklahoma to get attention. I wouldn't be surprised if that one dude claimed to know him from school or whatever was a sock.
I'm pretty sure that at least half of the crazy sh!t on this forum (ex: Oldies' post in this thread) is simply trolling/attention-whoring and doesn't reflect the beliefs of the people who make such posts.
I think that *some* of the red and orange avatars consciously (and possibly in direct coordination, on certain rare occasions, although that aspect is probably an Atlasia-only phenomenon if it does occur) use certain posters, Atlasia, and/or the forum in general as whipping boys for their frustration with the current state of American politics in general and the influence of the tea-party in particular.
The first two wouldn't count as conspiracies because you're only accusing one person of trolling in each case. I'm not even sure what the last one means.