People killed by their own inventions

Franz Reichelt was a tailor who was convinced that the next big thing was a coat that doubled as a parachute. So he got busy sewing and developed just that. To test the coat/parachute (coatachute? Paracoat?), Reichelt climbed up to the first deck of the Eiffel Tower. He told authorities that he was going to use a dummy to test the invention, but at the last minute he strapped himself in and jumped to his death in front of a large crowd of spectators.