This thread is right up my alley. I was a sort of a daredevil kid which transcended into motocross as a support rider for a few years so here goes some of my highlights:
On a dare rode a bike down the hill we lived on with my hands tied behind my back, not too steep long flat stretch at bottom, only problem bike had hand brakes, broke wrist and elbow.
While test riding decided to jump over a trailer to scare the people inside, failed to tell anyone and they raised the awning at the same time on the other side, ouch broke foot had to cut off a $300 pair of boots.
Once decided to car surf on an older race track, only massive road rash from that one slide right off damn turtle wax.
Had surgery and they had hung a bag of blood for a transfusion, told me not to play around, got up and picked up the cane I had to help me walk and punctured the bag, blood went everywhere including all over me looked like a murder scene, Needless to say the nurses were not to happy with me, believe they used the word restraints several times in one sentence.
Replacing an old worn out ball joint on a 66 El camino with a impact hammer put the damn chisel blade right thru my wrist. Stupid me holding the control arm and impact hammer at the same time was just an epic fail waiting to happen
Oh and the most painful and stupid one was my first marriage, that truly was self inflicted.