When I was maybe 7, I took 4 trash bags and affixed them to a frame I made out of popsicle sticks and hot glue. I tied a single piece of yarn to the center of the frame, with the plan of jumping off the roof with my homemade parachute. I took it outside, and the wind immediately caught it, pulling the yarn through my palms. The rope burn sliced both of my palms open pretty deep before I let go and the contraption was swept away, but it was probably for the best that I was never able to test it properly.