WEE DOOMSDAY SCENARIOS
SO PEOPLE WILL SHUT UP
THE SUN EATS US
As that guys diagram somewhere on the first page shows, in some inconceivably large amount of time into the future, the sun will be expanded to the point that it will swallow up the Earth, and most everything else up to Mars or Jupiter, before running out of it's nuclear fuel source, ending it's nuclear fission. At that point, depending on the sun's mass at that point (A lot or an ass-load), it will either shrink unto itself and become a white dwarf. A white dwarf, though small, has an unimaginably large mass and gravitational force. A teaspoon of the matter it's composed of would be equivalent to 10-20 tons. Or, the sun could become a black hole, and eat everything that's left.
Of course, by that time, we'll be gone by some other means no doubt. If not, the sun will still kill us with heat and drought as it grows ever so near us.
But hey. None of us will live to deal with that crap. :D
THAT METEOR FROM 20/20 KILLS US
In 20/20's doomsday special (Yes.), the probable one they decided was that a meteor, somewhat larger than what is proposed to have killed the dinosaurs, will collide with the Earth in some 20 something years. The entire continental area around the meteor will b obliterated by the force and shockwave. The rest of the world will deal with widespread tsunamis and an breathable atmosphere filled with ash and all sorts of bad stuff. Everyone would die.
You could hide in a bunker, I suppose, but eventually you would run out of supplies and die of starvation and/or disease, because the atmosphere won't clear up for quite a while.
What sucks is we'll be here for this.
OMG THE LORDY LORD
No.
LARGE HADRON COLLIDER EATS US
The LHC at CERN in Switzerland does generate black holes by colliding particles in it's massive ring shaped particle accelerator, but these are tiny lab controlled black holes that evaporate in hardly 3-5 seconds. Physicists at the LHC at more interested in the remnants of the black holes after they have evaporated than the black holes themselves, but do put a good effort towards studying too.
The amount of energy used by the LHC is nowhere near enough to generate a black hole that could cause substantial damage to the Earth or reality.
OSHT NUCLEAR FALLOUT WHERE'S MY LASER
The fallout idea seems very realistic, and also likely. If anything, this is the scariest of the bunch.
The general idea goes that in some event, be it WWIII, or Obama tripping on the button, a large amount of nuclear warheads are launched, and their explosions and the radiation they leave will obliterate all hints of civilization, leaving nothing but a dust filled radioactive earth. If this does happen, unfortunately, there will be no running. Whatever structure you hide in will be blow to pieces (With you), or penetrated by radiation.
I'm afraid I cannot guess when this could happen, but if it does, it will probably be a little near the end or middle of my life-span, maybe when I'm 50. If not, within the next 10 or so years. Otherwise, we can ignore it.
YOU HAVE BEEN EDUCATED