Planet X / Nibiru 2012 Flyby Scenarios - February 2009 Report
Okay, the theory, for those that don't already know, is that a planet called Niberu will pass into out solar system in 2012, and has done this periodically (I think 30,000 years is the rough interval) and that its passing can cause an E.L.E., or an Extinction Level Event, where almost all species on the planet die out.
Either it smashes through the oort cloud and peppers us with meteors, hits us with its tail of debri, or stimulates the sun in a way to assault Earth with solar storms.
I don't really claim to understand this much, but the video dumbed it down enough for me. I'm silly, I know ^___^ Urd explained to me over the course of a few hours how this totally cannot happen, and that the video ignores some key factor (like, uh, the rest of the planets) but I thought it was post worthy.
Hell, its at least a plausible Doomsday Theory!