Well, I agree with you, Kyriakos, that this is one of those things that it would be hopeless trying to get others to believe seriously.
Let's see, I might buy a few lottery tickets on the off chance that I could buy a ride on a spaceship with the winnings on December 21st and watch the world end from orbit, and then go off in some random direction after the world ended and gravity wasn't keeping me in orbit. Or just stay in orbit for a few days if it isnt' physically destroyed but just has mass extinction.
I'd probably start paying the minimum on all my loans and take out an extra credit card with as high of a limit as I can get so I have more funds come autumn. I'd still work for several months since I don't have many assets, but I might take a vacation to Europe and live large for a week in there. And then, come late summer, I'd probably quit my job and use what I'd saved up to travel and do whatever I wanted - to live life to the fullest. And then I'd also come home and spend time with family and friends for awhile, too. I could get a job in my hometown that would start in January, 2013 so my family wouldn't be concerned that I was being a total bum and would accept me quitting my job, all the while knowing it wouldn't matter beyond that.
And then, of course, I'd try to organize a big party on the 21st of December. But that's already been in the tentative plans for a couple years.
Actually, aside from the whole maxing out credit cards part, this might not be the worst idea ever if I decide I want to move back to my hometown.

I already pulled the "spring trip to Europe" from tentative real plans, maybe I should consider this more...