December 21, 2012
According to an interpretation of the Mayan Long Count calendar, this world (the fourth since creation) would end and a new would begin
The interpretation claimed the calendar began with the date of creation of the fourth world on August 11, 3114 BC by using a modified vigesimal, or base 20, tally count. (The Mayans used a base number of 20, rather than the modern 10.) Using the Mayan’s numerical system, it was concluded this world would then end on December 21, 2012.
This doomsday prophesy sent several groups worldwide into a panic, including Min Yingjun who stabbed and sliced several schoolchildren, and quasi-scientific communities who claimed a gravitational pull from our sun and a supermassive black hole would destroy life as we know it. A similar theory regarding the alignment of planets on May 5, 2000 in which Earth, the sun, the moon, Jupiter, Venus, Mars, and Saturn; theories about this planetary alignment included one particularly outlandish claim stating the gravitational pull from these masses would rip entire continents from the Earth.
After the world failed to end on December 21, some suggested the prophesy referenced a metaphorical end of an era rather than a literal end to life.