You wake up tied to a post. You're standing up, and your hooves are shackled to the ground. People are watching you from outside your wired corral. You can't whinny for help. All you've got is a wooden post and a tight rope halter fitted harshly around your muzzle. "Ah, the mustang's awake, sir," one of the people say outside. "Good. Let's begin the tests."