I had a close call just recently. I was on a trail ride with a couple of friends. All was going well, although my gelding was quite feisty, but everything was still manageable. We had already cantered a bit, when we came upon a long, beautiful stretch of a snowy road and decided to do some more cantering. I was asked to lead, as it was a new road and my gelding is very bold at exploring new places, so we thought the other two horses might feel safer as well. We started cantering at a relaxed pace, when the rider behind me asked if I could speed up a little, as her horse has a very wide stride and he had difficulties with keeping at a canter behind my gelding. Sure, no problems!
But, I had barely touched my gelding with a little of leg, when he hopped up in the air, unseating my overly relaxed butt, so that I lost a stirrup, and exploded into a mad gallop. I was hanging on for my dear life sideways in the saddle, trying to regain the stirrup, my balance and also some of my pride, and at the same time trying whatever I could do to slow him down. There were many side roads along the main stretch, and I was praying that he doesn't take a quick turn... After almost two kilometers, I finally managed to slow him down to a trot. All ended well, but it was very close to becoming nasty... I wore my helmet, but it was clear that a fall at that speed might have ended ugly all the same.
I have come a long way, to surrender my shadow to the shadow of my horse.