The French tailor Franz Reichelt tragically plunged from the top of the Eiffel Tower to his death on 4 February 1914. How did this happen?
Answer: Reichelt was obsessed with developing a suit for aviators that would transform into a parachute. He secured permission from Parisian authorities to test the device using a dummy dropped from the top of the tower. On the day of the experiment, however, he changed his mind, and tested the invention himself, promptly falling to a gruesome death.
Source: Epic Fail by Mark Leigh