wakey,

fell down stairs at 8 years old.
Severe concussion from bike accident at 10.
Beat up by an older bully at 11, just because.
Wrestling concussion when coach used me as a 'dummy' for our best wrestler at 13
Concussions from heading the ball playing soccer at 15.
Extreme high fever at 19. 105+ left me in convulsions
Vertical spinal compression accident at 19.

Only the soccer concussions were due to voluntary involvement.