As I lay here on my gurney, I have thought about the question, and I think that one of the most common things is that horses decide to do things at all the wrong times, but, they also permit one to plumb physical depths of which one was completely unaware.
Our new farrier was to arrive today, and there was a short window, just before the deluge, during which several horses could be trimmed.
Therefore, to demonstrate the laws of physical improbability, one of my mares, weighing in at approximately a Clydesdale weight, despite being an Arabian, managed to slip her entrie body between an opening of which we later were unable to slide a single sheet of typing paper, and decided to inspect every horse on the upper and lower forty.
She stood at the top of the hill, waiting for me, and just as I reached her, she laughed like a mad mare, and flew down the hill to the Mennonite Cemetary, to read the headstones.
This went on for about an hour, I ascending the hill, as she descended, then I descending the hill as she ascended.
Finally, she managed to wedge herself in a space, between one of the stallion paddocks, and an arena containing four mares. She immediately came into heat, the stallion tried to cover her over the fence and one of the mares in the arena, starting screaming: "THAT'S MY BOYFRIEND!" and striking the fence in the front of the runaway.
Flustered and uncertain, my mare swung around, sprayed a friend's car with eau du come hither and then tried to sit down on the hood of his car.
As death from a coronary was just as likely as being run over, I chose being run over and the mare was captured. I then realized that the outside of a horse being good for the inside of a man, probably didn't contemplate the possiblilty of the majority of one's arterial vessels being completely flushed of all plaque , thereby insuring another 60 plus years of life.
My firend later told me that as he drove down the country road, his car seem to be attracting an inordinate number of love struck geldings and a buck or two.
LMG aka LMGG