My retired barrel racer is seriously the perfect horse when doing ground work, he's attentive, all eyes on you, eager to do whatever you ask, calm and reliable. He takes verbal commands and is always very respectful...as long as you're on the ground. He tacks well, he stands and doesn't mind anything that you do, you can walk under him, around him, make noise, anything.
But once you're in the saddle its a whole different story. He doesn't mind you sitting there, he doesn't mind turning to the right . But anything else and he thinks its time to become a rodeo bronco, he spins and dances and tosses his head and bucks his back up like he's trying to pop his rider out of the saddle. I've had the vet out to look at him, I've had the farrier out to look at him, everyone tells me that he's 100% so it isn't health related, we've tried him on different bits and even a hackamore, bareback and saddled.
At first I thought it was just me, that I lacked the confidence but I've had experienced riders over to test him out and see if he'd mind for them but its the same song and dance no matter who is on him. Unless there's someone on the ground, then he follows like a puppy dog and does everything you ask, he just refuses to listen to a rider!