Just 1, almost 20 years ago. :afm199
Second day on any motorcycle, practicing shifting and turning in a very small parking lot, I fixated on one of those concrete bars at the head of a parking space while in the middle of turning around, drove straight into it, and fell over to the left. =>doink!<= And I was wearing a poser jacket with no padding/armor...
Took a lot of the impact on my left shoulder and broke the collarbone. But I didn't realize it, and was horrified that I had dropped my friend's bike, so I quickly levered it up and went back to riding in circles. Until the third lap or so, when I realized my left arm wasn't working right anymore...