I was in a small jumpers class, at a schooling show, and I was riding my favorite school horse who was a great jumper, I got through my round REALLY really well, very smooth and no faults, and the girl who was going next took it into her head that she could ride this schoolie as well and maybe do as well as me!
Well here was the problem, 1. She was a VERY [I don't want to say bad..] inexperienced rider, and 2. She had NEVER ridden this school horse before let alone jumped him.
She got on, a few jumps in lost her balance and fell off of him, and the horse continued to do the course, and completed it riderless as she sat there baffled.
I got first, in that round, and let's just say that she wasn't as successful.