The old school plankers didn`t snap engravements, run away and publish it on their wall. They did it for the damage. They wanted to die. They wheren`t playing around like kids today. Quality of life was so poor in those days planking was a way of showing disrespect to society and protest against the life they where given.
Cause of the bodies poor state after the plank, each planker had to be preserved before the honorary engravings on the Egyptian wall of fame. Centuries later, when living conditions got better, people forgot about the plankers and mixed them up with mummies, who originally, where large scale diaper users.