About a thousand years ago, my sister sponsored a horse for the winter from a summer camp in Malibu. "Dice" was maybe the most miserable animal that I have ever experienced. Dice would try to bite everybody who did anything nice for him - including feeding him. No one could ride him - he would bite them or just be generally unreasonable. I took this as a challenge - one of us was going to give, and being 18ish it wasn't going to be me!
I threw a saddle on him (which pissed him off big-time) and proceeded to mount him - it wasn't pretty, but he learned soon enough that he was NOT going to rule this encounter!
One of the happiest days of our Malibu life was when we gave that POS back to the camp...