Since December 21, 2012 is soon coming, only a couple of months from now I wish to share a list of theories about what could happen on that date. I am sure this is not all of them so feel free to add anything I missed.
1.) The Earth is hit by a massive solar storm. This solar storm knocks out all modern technology and pushes humanity back into the dark ages. In addition, following this technology black out, people will start to die from hunger, fighting and lack of medical care.
2.) The Earth will be hit by an extraterrestrial object. This object could be comet, asteroid or possibly a wondering star or planet. Common belief is that earthquakes will increase in numbers before impact.
3.) A wondering black hole is getting closer to the earth, and will consume the earth.
4.) A pole shift will cause massive earthquakes, storms and other strange happens to occur.
5.) Upon crossing the black shift, the earth will be hit by gamma radiation killing all life.
6.) Nuclear War started out of the Middle East, or some other nations.
7.) A superbug infects and kills off a majority of the population.
8.) A super volcano erupts and pushes the Earth into a nuclear winter.
9.) An alien species invades earth.
10.) Beginning of the Biblical doomsday.
11.) The Veil fails and allows spirits freely to enter this world, these spirits due to being from different astral levels beginning to fight each other and/or possess people to live again.
12.) Psychic abilities are massively increased.
13.) An enlightenment about the truth of the universe.
14.) The Veil fails and demonic and angelic armies invade earth and fight a war.
15.) A massive war between all spirits and people occurs upon people gaining massive abilities from the enlightenment. Here everyone either fights for themselves or in small groups.
16.) A spiritual war in the spirit world goes full scale, while not physically affecting this plane, it spiritual affects it. Some people who are players in it will be pulled into through uncontrolled astral projection and will remain there until it is over.
17.) Nothing happens.
18.) A mixture of events above.
I know more details about these events so if you are curious to know more about one just ask.