Alleged judgment day: December 21, 2012
Here's the big one—the biggest uncertainty out there. Even Hollywood was kind of shook, releasing a movie (2012) about the fateful year a full three calendar-lengths before it could happen. The 2012 theory comes from the Mayan calendar; their 5,125-year-long cycle ends on December 21, 2012. What happens after that? Shit starts bursting into flames, animals go nuts, earthquakes pop up everywhere, and John Cusack becomes our only hope.
Actually, we're still pretty uncertain about this one. And given the rise of UFO sightings, natural disasters, dead animals, and Oprah Winfrey's TV show ending, we’re a bit nervous over here.