1. I think 2012 is just a way to instill fear in people (for example where I'm at in America) to get people to believe in the government that has been failing us and getting us into a debt hole we may never get out of.
2. I believe in both.
3. Yes, with ghosts especially. There is a cemetary near where I live on a country road in the middle of nowhere, if you go there at night you WILL see something. Even skeptics have witnessed creepy things, orbs, screams, a woman in white walking around and the list goes on.
As far as aliens or UFO's I've seen strange flying objects occasionally.