A large asteroid hurtled towards the Earth. It was almost a fourth the size of the Earth, and made up of iron and heavier elements that made it a powerful bullet in the skies. Its relative speed with respect to the Earth was large enough that scientists were certain it could destroy three-fourths of the planet and decimate all life on Earth in a few seconds, including the roaches. Unfortunately, the scientists only had a day to realize the danger, and powerful governments were left with no more than a few hours to take action.
But take action they did, and several variants of inter-continental ballistic missiles were launched towards the rogue asteroid in rapid succession.
Space, being as vast as it is, all of these missiles missed their targets by a few hundred miles. The asteroid slammed into the Earth and that was the end of that. No one complained.