Some horses love to practice their stuff. Osiris is one of them. I can set a basket of hay on the ground in front of him and ask him to perform one of his favorite behaviors (target one of his body parts to my hand). He does the task and when I give him the bridge signal, he dives his head into the basket and helps himself. Then he returns to ready and waiting position for the next command.
I think he is enough of an Animal Entrepreneur that he would make a very fine trick horse. And, you could buy him for only $25.