In the early days of flat tracking, yes, several times and once to the hospital. Really sucked to say the least. Heck, I even had many brain cells at the time, but just didn't get it when it came to letting off the throttle. In those days we were not allowed to have brakes either! Was it fun, yes and I'd do it all over again.
Now since then, I've dropped the bike a few times in the snow and once in a parking lot when my leg cramped up on me. I haven't dropped my current bike nor have I been in an accident . . I think I'm good. But,. . Now I'm ever practicing, watching and playing the "what if" with escape routes all the time.
Ugly John