littlesparkvt writes: Impact of Asteroid 2012 DA14 would hit the Earth with the force of 185 Hiroshima Bombs or 1700 Kilotons. The impact of Tunguska in 1908 destroyed an 830 mile radius, 2012 DA14 would have a similar blast area. Link to Original Source
Of course you can't flap your arms and fly to the moon. After a while you'd
run out of air to push against.