Well, as most of you know, the world was believed to have a slight chance of ending today. Some supercollider or another was supposed to generate a black hole, ending Earth and our entire solar system.
Another theory says that on December 21, 2012, the world is going to end, due to the alignment of the Earth, the Sun, (I also believe the moon, but I don't recall.) and the center of our galaxy (Or is it the universe? I don't remember.), and the end of the Mayan calendar.
I personally believe the world isn't going to end until the time comes when the Sun consumes Earth, as it inevitably will, in about 200 billion years.
Thoughts?