I sure hope some world-changing product is released on 12-21-12, that way I can ask for it on my birthday the day after. Maybe something like a cellphone, but with a holo-screen that has a sentient AI program on the inside to help manage my access of the internet. Besides, I'm not that worried; I turn 18 the year before, so what do I have to look forward to on my nineteenth?
Actually, probably around March 17, 2012, somebody at the CERN center is going to say:
"Here, hold my Captain and Diet and watch this!"
At which point he drops a twinkie into the particle accelerator. This creates a space/time paradox from the magnetic fields trying to stabilize the mass that is so dense with preservatives, the particles are altered as they tear into the twinky.
The resulting shrapnel combine into black holes, gravitating to the Earth's core.
Here they gather and grow until the core is consumed and the world implodes in a huge 'Poofski'.
Game over, man!