#1. A collision with an asteroid.
1001 Ways the world might end
Psychlos invade earth and, with the help of John Travolta, enslave and then destroy all of humanity after taking away all our gold.
Misuse of nuclear power resulting in a mass extinction event.
Sun will become a red giant and gobble up our Earth - this is the most likely thing to happen but we don't have to worry as that's gonna take another 5 billion years.
-Confederate Nazis discover Greenland, carrying with them Odin's curse which contaminates all the pastries.
Let's see if we can amass 1001 ways the world might end. (dedicated to oinquarki)