I've only fallen off my horse once, so far as I can remember (my last horse I fell every time I rode bareback); I adjusted to the 'way he spooks' fairly quickly. Rush does however have the uncanny ability to go from Okay-Country Pleasure to Top Ten Reining horse in about .03 seconds.
Let's see... I decided it would be a great idea to ride my Country Pleasure horse outside (he does love being outside versus the arena, but he is NOT a trail horse, nor is he settled enough to know what to do with himself outside). He gave me no issues at the walk and trot, though when we were cantering, he wouldn't stop.
"Rush, that's a fence."
"I know mom, isn't it awesome! Ouuutttsiiiiddddeeeeeeee OuO"
"Rush, no for real, that's a fence. Slow down, I don't know what lead you're on."
"MOM LOOK IT'S A FENCE. LETS RUN EVEN FASTER."
"YOU'RE NOT A JUMPER. YOU'RE NOT EVEN A HUNT HORSE. YOU CAN'T EVEN STEP OVER A POLE WITHOUT HAVING AN ANEURYSM."
"Oh, you're right, trotting would be a good id- WAS THAT A BIRD?????" *sliding stop*
I went over his neck and landed on my backside fairly hard
To his credit, he didn't run off, even though I hadn't let go of the reins (I decided to ride in a full bridle that day), and I'm sure that didn't feel good having his mouth jerked around with two bits in it. I fell because when I ride with my stirrups, they're up just
high enough to apparently topple me (I now ride with them where they are suppose to be). I found out the hard way that when he spooks, I push myself against my stirrups as a brace (which is not good when said pushing puts you out of the saddle, on the neck, and then on the ground).
The second time I did ride it out, by the grace of God alone. I was riding him side saddle in the indoor arena, and someone must have ridden in it since the last time I'd used it, as the stirrup was jacked up waaaay to high. Because I'm stupid and trust this horse (skittish though he may be), I was not holding the reins, bent at the waist over the saddle to adjust the stirrup. We weren't next
to one of the gates that lead outside, but apparently close enough that when a bird decided to take off, he thought something was trying to kill him and promptly spun in a manner that would put any reining horse to shame.
I didn't even realize what had happened until after it was over, and my fingers were super glued to any part of the side saddle I could get a hold of. (Thankfully those jump bars make it impossible
to come out of a side saddle! Just clamp down your thighs and you're set!) Again, to his credit he did not take off, despite how easy it would have been considering I was not anywhere close to my reins.
You fall a bunch, and then eventually your body just knows how to anticipate your horse. You're growing as a rider, congrats!