The worst:
I was trail riding a mare bareback and from a standstill she flipped me onto my back onto a rock....I limped for two years. Muscle damage. I kept riding though!

the most recent: about a month or two ago the filly I was training ran me straight into another horse and jumped away, breaking my helmet in soft sand. i landed hard on my head. The reason for the spook: another mare had swished her with her tail while trotting past. My filly was in heat. She was offended I guess.

My most embarrassing: I was working at a trail riding place and I decided to gallop our ex-racehorse TB down the driveway during feeding hour. He sure galloped at about 40 mph and dumped me on gravel in the parking lot. I got run over while being dragged under him. Fortunately I only had a few scrapes. Not sure how I got out so well. learned not to ride that way during feeding time.

Oh, I have many many more LOL. I am fortunate that although I fall regularly I do not get hurt too badly Knock on wood!