Drone Smashes Through 5th Floor Window And Smacks Guy In The Head -

And it was probably only going 20 mph or so. What if it had hit an airplane windshield with an additional 100 knots speed added to it?

http://www.neatorama.com/2016/04/14/Drone-Smashes-Through-5th-Floor-Window-And-Smacks-Guy-In-The-Head/