Sometimes I walk right into the poles while I'm walking and I never learn to watch out for them.
Last winter I was going shopping ant the pavement was slippery. So there was this slope I always walk on while going shopping, so I stepped on it and my leg started sliding down. I thought a brilliant Idea would be to put my other leg on the same slippery slope to "keep the balance" but I'm the kind of person who falls while standing still so I have fallen, hit my knee and also dropped my phone. The phone was fine, but somehow the Google assistant turned on by itself and asked me if something happened. The urge to say "I have fallen and I can't get up" wast strong... xD
Another story about me being careless, this time from from childhood... There were those wooden houses on the playground. One was like one meter above the ground and had one plank missing, because apparently tearing apart playground structures is super fun. Anyway I was always paying attention not to fall through that hole. One day I didn't and fell. At the moment I was lucky I was a chubby kid, because my butt stopped me from hitting the ground, by stopping me in that hole (I didn't get stuck luckily). Didn't stop me from having a big ass bruise on my thigh tho... xD
Also if I could get a penny every time I scrapped my knee as a kid, I would be rich today.
Anyway... If you think you're clumsy, one of my friends accidentally cut herself with a baguette and has scars from it. xD