Japanese definite ministry spherical drone
OK, now this one is seriously creepy. Aside from looking like some sort of floating camera from a Hunger Games-style game show where contests are forced to battle to the death, it moves around in a disturbingly agile way. It can hover in mid-air, for example, as well as fly vertically and horizontally at speeds of up to 40 miles per hour. Three gyro sensors in the body keep it airborne even if it's hit and it can even roll along the ground like some sort of evil football. The drone was designed by the Japanese defence ministry, and built from spare parts costing a mere US$1,400.