I'm quite clumsy and uncoordinated, though I just think it's something that comes with being an aspie. It frustrated the hell out of me when I was younger, because my friends were all getting into skateboarding, and I could never figure out how to ride a moving skateboard without falling off, let alone how to do tricks or even pull a simple ollie.
I used to trip over my own feet all the time, and sometimes one of my feet would just randomly tip onto its side and cause me to fall over. I never understood why this would sometimes happen.
I'm also terrible at throwing things or catching things in mid air. I could never figure out how to throw a football the right way, throwing a frisbee without causing it to turn sideways and lose lift is somewhat of a challenge, and throwing a basketball into a net can be infuriating for me as well.
There are numerous other examples, but I can't think of how I'd write them out at the moment.