The Earth is growing:
HIV doesn't cause AIDS [http://en.wikipedia.org/wiki/AIDS_denialism] or even worse that AIDS was man-made [http://en.wikipedia.org/wiki/AIDS_conspiracy_theories]. Always a good laugh.
I remember hearing an extremely hilarious one about pedophilia posted on 4Chan. I can't remember exactly how it went, I was too busy laughing while reading it. It was like an onslaught of corny assumptions, filled with as much strange, ridiculous political vocabulary as possible. I'll try to find it.
OH SHIT I almost forgot. The TIME CUBE! [http://www.timecube.com/] I shit bricks with laughter every time I read this. It's a mix of his ridiculous theories and strange wording and different colored text.
YOU CAN"T KILL ME, FOR I AM 82 + CANCER.
