Sort of this: we asked 100 people sitting on a plane to jump out, with or without a parachute. All those who accepted the challenge were sitting on a fake plane

Sort of this: we asked 100 people sitting on a plane to jump out, with or without a parachute. All those who accepted the challenge were sitting on a fake plane standing still at 0.6 metres from the ground. We saw that the use of the parachute made no difference.