The most absurd I've heard actually originated in England, but has caught on with a few in the states. It states that there are lizard people in hiding ready to take over world governments, including the USA.
The guy, David Icke is certifiable. And, he has a bunch of conspiracy theories, too.
Anyway, the woman that organized the failed truckers against Obama protest (or coup?) was a devote follower of him. And if I'm correct, she made the list on Encyclopedia of American Loons. So, yeah, they're here.