My first piece of evidence is that ancient Mayans predicted the world would end in 2012, and they've been right about everything else so far. Surprisingly, so does Mitt Romney, and that is a very reliable source. There have been hints and messages trying to show us that 2012 was a real thing for centuries now. Like when Galileo developed the telescope or when the movie 2012 came out.
Although unicorns undoubtedly prove the existence of god. That doesn't mean that 2012 won't happen. There's lot's of people who believe it will happen, and it certainly could if like an asteroid crashed into earth and killed us all. Or the polar ice caps melt due to like nuclear testing or something. Or even more likely is that a solar flare from the sun incinerates us all and we turn into ash. There's lots of ways it could happen, and it will because there is no proof it won't.