What many people don’t realize is that even non-sports-related concussions are more common than we think. (Just ask Justin Bieber, who got a concussion by walking into glass.) According to the Centers for Disease Control and Prevention, falls were the leading cause of concussions in 2013. So although staying away from bashing helmets with the biggest men in America does help, it doesn’t make anyone less immune — even singers and actors whose stunt failures and onstage prop mishaps sometimes lead to concussion.
