Oh boy, I've had too many to count.
The first ones I can remember were just silly falls. The first one I can remember, my mom was hosting a horsemanship camp at the farm. I was probably 4/5, when she was working with the students, I was put on ol' Jug, the resident plug along babysitter bareback and parked in the middle of the arena. I was little and bored, laid back on her butt and fell asleep. One of the boys riding in the clinic, loped past and smacked the old mare on the butt. She startled awake and I woke up when I hit the ground. My mom had him clean all 15 stalls, rake the barn aisle and pull all of the weeds along the arena fenceline
The second one I can remember - When I was very young, I had an awful habit of riding with my toes out. My mom preached and preached about it. I was riding in the outdoor (I think I was probably 6 or 7) and at that time, the fence was cattle panels. I was loping my mare and got my toe caught in one of the panels and got ripped off her back. Thank goodness for that sweet old mare, she locked em up and the looked at me under her belly like "Hey, you're not supposed to be down there."
Since then, there's been quite a few but at this point I only recall the very memorable ones. There was the time I rode Jana outside in the spring w/sliders on and stupid teenage me didn't think about the frozen ground under the topsoil. She stopped, hit ice and lost her legs. She ended up on top of me and I cracked 6 ribs. Had a couple go over backwards, a few that were bucking stock quality rides, and even more dumb should have been paying more attention spills.
It's just par for the course. No blood, no foul, brush yourself off and get back on.