Taken from the website: http://www.abhota.info/end6.htm
"Terence McKenna combines Mayan chronology with a New Age pseudoscience called Novelty Theory to conclude that the collision an asteroid or some "trans-dimensional object" with the Earth, or alien contact, or a solar explosion, or the transformation of the Milky Way into a quasar, or some other "ultranovel" event will occur on this day. Anyway, something is supposed to happen, and he has lots of pseudoscientific gobbledygook to back up his thesis."
If this isn't soom enough for you look into March 21, 2008 - "On this page, the Lord's Witnesses use convoluted numerology to demonstrate that "the end of the world is 2008 March 21st." They also claim that the United Nations will take over the world between March 26 and April 24, 2001, and afterward nobody will be able to buy or sell without the Mark of the Beast! "