When I was younger I was feeding ducks at the locks in Lindsay. There was a big railing where you could lean over and throw bread. Well me being so little, leaning wasn't a good call and I fell forward, landed on my back and was knocked out. I managed to avoid two random tall sharp poles but my mom picked me up which wasn't a good move. Luckily nothing serious happened though.
Just come cuts on my back and that's it. Fall was close to 8 feet though. She scared the $#*t out of my cousin who was there with us, she kept yelling for 911 etc. and he ended up going home later. He just sat on his couch apparently wide eyed and wouldn't say anything.
Other than that nothing too serious, broke my ankle once playing soccer.