Good Lord! I feel like a wimp sharing my worst injury! Some of these stories make me wince just reading them.
Probably my worst injury was my first ride on Scout. I found him online while I was away at school, my sister checked him out and test rode for me w/t (he was ungodly skinny, so no canter), and decided that if I decided that I didn't want him when I met him she'd buy him from me. Yeah, complete wrong way to buy a horse.
The next weekend rolled around and I got to meet my new guy. He was very thin, but the family assured me that he had gained weight in just the few days he'd been home. I had to test him out, but didn't want to run him in his condition. So I popped my English saddle and snaffle bit on him and took him to the arena, sis following with her QH.
We rode around, checking systems, and eventually got into trot. He was forward and bracy, but controllable. Sis passed by us at a WP jog, and Scout bounced up into a canter, and in the first stride bucked once. I ate dirt. I'd have stuck in western tack.
I rolled over my shoulder and embedded a sizable amount of footing in my t-shirt and skin. Scout's nose was snuffling in my face, for all the world asking what I was doing on the ground. Got right back on and into a trot, but I couldn't climb up the hayloft ladder for a week.
In hindsight, I figure that Scout had never cantered under saddle before, and the buck was a reaction to the girth on him at the canter. The same reaction was par on the lunge, too. He worked out of it pretty easily, and canters without bucking now.
Apparently I've been darn lucky. I've had my feet stepped on, but never badly, never been kicked, struck at, or charged. Usually my own stupidity leads to a fall, and it knocks the wind out of me, and life goes on. Then again, I'm young. Someday I'm sure I won't bounce as well.