Long before email, it was predicted that the USPS would deliver your mail by rocket http://t.co/XhIdgq8iob http://t.co/KQzOp7gq2l
— Jared Keller (@jaredbkeller) July 18, 2013
I'm not sure it qualifies for the drones tag, but I don't think I can call Postal Service by Projectile: Delivering Mail with Rockets scifi either.