Brian Walker has planned to shoot himself out of a self invented giant crossbow.
From the story:
This isn’t Walker’s first outlandish invention. He’s responsible for the “light chaser” whirly toy, a 300-gallon water-balloon launcher (for putting out forest fires – still in prototype), and Taser gloves (featured in “Garage Geniuses Go Prime Time,” issue 14.03). But Project RUSH – for “rapid up superhigh” – is hands down his most preposterously dangerous effort. “I missed out on the opportunity to be the first private citizen to fly to the edge of space in a private rocket, so I decided to do something even more fun,” Walker says.