I went on a forum for dog fanciers (is that the right word? That makes it sound like a fetish site...). The place was crazy, they were actually talking about raiding a similar cat lover site. They had a little schedule and everything. One of them was even gonna launch a Ddos attack on the place, it was horrible. I can honestly say 4chan was better.
EDIT: Also people that believe in Jesus Aliens. Not a technical term, but they picture aliens and god all working together and shit.
Like this guy.