Well... Oz was in the hospital for the first three months of his life so he never learned to be a proper horse. Then he got beat to pieces by the gray mare in my gallery so he's got good reasons to fear them.
Hehe, that's cute. I don't have the slightest clue where you'd even start to teach horses tricks like that. I'm so jeaulous, he seems like such an awesome horse! I noticed that he isn't tied up or anything in the barn, yet all his attention is on you.
He's a very SMART horse, which is both a blessing and a curse. He can do a lot of neat things and get us out of trouble, but if he doesn't want to do something, good luck! He's the most stubborn horse I have ever worked with in my life, which is how I ended up getting him for free.
As for the smiling trick... it's something he would randomly do from time to time, and I thought it was cute. I started saying 'smile' whenever I caught him doing it and giving him carrots. It took me a month and a half of consistent trying to get him close to even doing it. I finally had him in a stall and stood just out of range with the carrots, just saying the word smile over and over again. When he started fiddling with his lips, I praised him. When he flipped the top lip, I gave him a treat. Now he thinks it's the best trick ever and does it for anyone who will stand still long enough to watch.
Wow! What a horse! He's so cute. I think it's good to teach horses tricks. Some (if not most) enjoy a challenge where they get to think. The horse I ride is being trained too, and so far he can lift a bucket on command. How did you manage to teach him to smile? That would be such a cool trick to teach Casper (the horse I ride).
I just replied to another comment with the way I taught him to do it. If you scroll down, you can see the detailed version, but it was something he already did periodically, so I just encouraged it until he got the verbal cue.