2004MN

Asteroid 2004MN [wikipedia] Impact Analysis [NASA].

This is the "It's going to hit....wait, it's not going to hit...." asteroid that may or may not make impact now in 2036.

Now, after the lastest simulations, it looks like this badboy might just hit us after all. It will make a very close approach in 2029, inside the range of where our satellite TV birds are. The Earth's gravity will alter it's current orbit, and this alteration might be what will take the event in 2036 from another near-miss to an actual impact.

The impact will be rated at around 850 megatons, which is HUGE! Human Race Extinction Huge. You can expect a impact winter afterwards, assuming that you survive the actual event. What a nice way to instantly reverse decades of global warming!