plenty plenty plenty.
the one that occurs to me right now is, my neighbor had that sidewalk that is FILLED with little annoying ass pebbles (death sidewalk we used to call it) and i was riding my bike when i heard my mom bursting out laughing on the front porch, and as a kid i couldn't help but turn to look to see what was so funny, and in that moment my handlebars turned 90 degrees and i went flying over the bike, landing on my elbow which scraped 2-3 feet across the fucking death sidewalk, and my elbow bone was sticking out with a ridiculous burn going down my whole forearm.
all because i had to turn and see what was so funny...
also me and my friends one time were biking offroad, going through an apartment complex, we jumped over a curb and went down this steep hill, and we went by some garages, but the height of the garage wasn't parallel to the grass around it, so the grass went up and the roof didn't, and i ended up closelining my head from the roof of the garage.
edit: OH
a funny one that happened to my brother, i used to run on the treadmill to build my endurance for soccer, and i accidently left the key in it, and my brother (who was 5 at the time) walked in a few minutes later and thought it would be cool to play with all the buttons...he accidently cranked it to top speed (12.5ish mph i think?) and started to scream as he couldn't move fast enough, and he tripped on it, hit his face and went flying backwards about 10 feet into the wall.
luckily..i saw the last part of that, and laughed so fucking hard...i don't care if it makes me a bad person, but it was so fucking funny.
about 30 seconds in, is exactly what i saw, but with a high pitched 5 year old...it was so funny.