I left work early today so that I had plenty of time to work with my bad boy. I approached him in the pasture and, sure enough, he laid his ears back in an aggressive manner as soon as I approached him with the halter. But this time, I was ready. I was equipped with a lead rope, a lunge whip and a plastic bucket. I spent the next 45 minutes running his tail off. I was able to chase him into an adjacent corral that measures about 150 x 150. I growled, yelled and screamed at him until I practically had no voice left. I cracked the whip and threw the bucket at him so that he was on the run almost constantly. I took a couple of brief breaks and then went at him again. After about 45 minutes of this activity, the change in his behavior was nothing short of miraculous. My wife was there to witness the entire event and said afterward that she couldn't believe the change in my horse. At the end of my 45 minute rant, he stood motionless and watched me like a hawk. I approached him with the halter and he did not move a muscle. I slipped it on him and he didn't so much as flinch. I then lead him around the corral for about 15 minutes, stopping and starting at regular intervals. He was as gentle as a lamb. Again, almost a miracle. I then turned him loose and opened the corral gate so that he could join his buddies in the pasture. But he didn't leave the corral and was still there when I drove off about 30 minutes later. I am not suggesting that the horse is cured. I will probably have to replicate this exercise several times until he fully accepts me as his boss, but I was absolutely stunned at his behavioral change after this 45 minute activity. Thanks to all who gave me such great advice! Due to work commitments, I won't be able to work with him again until Friday afternoon. But rest assured that I will be prepared for another "come to Jesus meeting" with him if he demonstrates any aggression towards me what so ever.