2012! The prefered way of elimination!

[Macgyverthehero]

How about a unicorn invasion. There will be unicorns equal to the amount of humans, and we will all ride to the rainbow country, where all our friends and family will be. And we will watch while the destruction of earth will continue in a massive firework of nuclear powerplants and fastfood. And we will all die in happiness, as the unicorns consume our souls until we become empty human bodies.
The unicorns will start a new generation. They will learn from our mistakes and they'll all live happily ever after.

As long as these unicorns don't originate from a kids's cartoon show I'll be fine with that.