The Mayan or Mesoamerican Long Count calendar ends (according to some calculations) on December 21, 2012.
Pseudo-theories and predictions dealing with what will happen on that date abound. They range from forecasting the dawning of a 'new age' and the gaining of a higher level of consciousness and grace by Humanity to the utter destruction of the planet by either electromagnetic pole reversal, by direct impact or cosmic influence of Planet X -known as Nibiru in esoteric and occultist circles- or by the unique planetary alignment that will supposedly take place at the center of our own galaxy, the Milky Way on that day.
Others still see this date as the Day of Judgement or the day the world goes up in flames in the Battle of Armageddon; yet some predict First Contact with an alien superhuman intergalactic species, perhaps the creators who promised to return...
Something to think about...