I had a terrible match with a POA that I refer to as my “POS POA”. I bought him to be a second riding horse for me so my (now) ex and I could trail ride together. He has supposedly done PPGs and all kinds of pony club things prior to his owner going off to college. I bought him knowing he had been sitting and had only had a few rides back.
Got him home, had a few okay rides. Trail rode him a couple times. But I made the mistake of getting sick and giving him a few weeks off. When I tried to ride him again he was having absolutely none of it and tried every trick in the book. Crow hopping, rooting his head down and stopping dead, baby rearing.
I realized I had a perfectly reasonable mare I adored that I wasn’t riding because I was trying to fix this horrible creature. I also couldn’t afford to get hurt.
I posted him for sale for a reasonable price and disclosed everything, noting that he had been a kid’s horse previously but needed some fixing that I wasn’t interested in doing. Someone requested video, so I figured I could lunge him thoroughly and try to get a brief video of riding walk trot. Most of the issues came out with the canter.
Lunged and he was remarkably quiet and pleasant. Got on and he bolted sideways, ran to the concrete pad in front of my barn (I had a very backyard setup at the time) and bucked me off as hard as he possibly could. It was deliberate and calculated. I could barely move for 3 days.
Told all interested parties exactly what happened and sold him to the first person to show up with $500 and a trailer, because I no longer cared I just wanted him gone.
I’m still not sure if I was ‘over horsed’ or if the spotted turd just hated me specifically, because the buyer had her 7yo beginner child riding him within a month. But regardless, I threw in the towel when I was missing rides on a good horse to try to fix the problem one.