I have seen other people do what I did, and could not understand how someone could do something so lame and then I did it. I still am not sure how I could have been so lame...
I do not ride a lot of different horses, mostly just my mare who is built like a tank and trained to stand still for mounting. I also usually mount from a mounting block to save her back. One day I was at a trail head and was going to ride my friend's horse, a nervous, narrow backed mare who does not stand still for mounting, and I was mounting from the ground.
I got her to stand still for a split second and went for it. I dunno if I was too exuberent because I was not used to mounting from the ground, or simply mistimed because I am used to a much wider horse, but whatever the reason, I completely overshot the saddle and ended up on her off side, my left foot wedged in the twisted stirrup from the near side. The horse was starting to panic. I reached up and quickly worked my foot free with my left hand, and fell on the ground with a mighty WHUMP. I had to let go of the reins even though I still had them in my right hand when I fell, because that mare was outta there, not going to stick around for any more of my antics. So I let go of her, as she raced off I stood up, brushing myself off and looking around to see if anyone had noticed my folly, nobody was in sight.
I then yelled, "loose horse!" & my friend, who was getting her other horse ready came out to see what was going on to discover that the loose horse in question was actually hers. After the initial scare, the mare trotted back over to us. We call her the vel-cro horse because she hates to be alone, and in this case it was a good thing, I was terrified she would get out onto the highway.
I was mortified.