You can add “Russian guy with a spear” to your list of things your drone should fear. A Russian man at a history festival made his displeasure for drones known by taking one down with a spear.
The drone belonged to one Gennady Tolcheyev, who was out capturing some aerial shots of a historical reenactment in central Russia when a man dressed up as a (historically accurate, we assume) Russian warrior hefted a spear at his drone.
(via Laughing Squid)