Horses are not only smart, they have a keen sense of how to act to get you to let them off the hook so to speak. My stallion will be an absolute TURD and then he'll do something that makes me laugh. He has figured out that if I laugh I can't kill him. I end up telling him he's funny and gosh, look at that, I'm out of time to make him work and have to move on to the next horse. He doesn't get me as often now that he's 5 and I've had him his whole life, but every now and then....Yup, suckers me right in and he's out of work, off the hook. When he was a baby, he was so adorable it's a wonder he ever got halter broke.