If there was ever something worthy of being called a chopper, this crazy contraption is truly it. The radio-controlled helicopter not only has rotary blades, but it also has a chainsaw attached to it. The three friends from Finland who made it have nicknamed the invention their'killer drone', and used the test flight to hack at trees, icicles and snowmen. Test-run: The three friends from Finland who made it have nicknamed the invention their'killer drone, and used the test flight to hack at trees, icicles and snowmen Beheaded: The snowmen's heads were immediately reduced to nothing when the chainsaws hit them, sending a cloud of ice and slush flying through the air Miika Ullakko, Henri Kiviniemi and drone pilot Antti Junnari came up with the idea as a joke after seeing videos of drones delivering mail. Miika said: 'Anyone who's ever flown a drone knows how ridiculous the idea of a drone delivering mail is.