Nibiru (Planet X)
The whole Nibiru thing is sheer idiocy. Why people believe that "planet-X" is going to crash into Earth is beyond me.
Considering that astronomers have been observing the skies with telescopes for around 500 years, why haven't we seen Nibiru coming? A planet bigger then Jupiter should be fairly easy to see with the naked eye.
Also, shouldn't we be noticing higher tides, or something else to that effect right now? With this large planet so close, we should be noticing the gravitational effects from it.
2012 = Hoax. I see no validity in any of the claims made by the "scientists".