No. 5 - New Year's Eve (or Civilization’s Impending Doom)
There are only a few people expecting the end of days aside from the usual wackadoos who would give anything to quit their jobs and preach the end of the world, but there’s always that slight chance of coincidence. What we know from history is that the people of the planet Nibiru took a wrong turn somewhere in the galaxy and missed Earth, and there’s also the ancient Mayans who screwed up their calendar year because they didn’t have proper education. It looks like the world will live on to 2013, and those people who quit their jobs will feel like real a-holes when they’re hopping back into the unemployment line.
Of course, there’s always the chance it could happen, and we should always be prepared with a sturdy storm shelter, canned food and by telling everyone our true feelings before it’s too late. And then if it doesn't happen, we can still get drunk together on New Year's Eve.