I knew better than to run around when mom was mowing because i saw what happened when a kid slipped on grass and fell under one. I knew not to handle firearms because I saw a boy accidentally shoot his dad when he tried to get it away from his son. I knew not to ever walk with a knife, even a butter knife, because I saw a little girl accidentally stab her brother when they came running around opposite sides of a corner. I also knew not to hang around when dad was working in the utility room because I saw what happened when a fireball hit and severely burn two kids who were playing in the doorway. And I never rode my bike without a helmet because I saw a little girl flip over her handlebars, land on her head, go into a coma, and then have to relearn how to talk/eat/walk/go to the bathroom.
Granted I knew not to do a lot if those things anyway because I was a pretty obedient child but there was definitely something about seeing the worst case scenario play out that scared the wee outta me. Leads me to wonder if kids nowadays weren't so sheltered (as many are today) and actually saw what could happen if some of the daily accidents we read about could be further prevented.