Well I thought that it would be good to create a thread for all the people who are teaching/taught their horse(s) tricks. You can ask for advice, show pictures, videos and just talk about how you taught your horse tricks and what trick it was.
I've taught my ex-race horse TB a few tricks I've taught him to bow - with and without rider, Paw, Smile - His still trying to work that one out and at the moment I'm teaching him lay down.
The first trick I taught Chinga was bow, it was the hardest. He would back up or when he started to bow he would freak out and pull his head back up. But now he can do bow very well.
To teach him smile, I gave him a kiss on the nose one day and he "smiled", so I automatically said smile and gave him a treat, now everytime he does it I say Smile and give him a treat.
Paw was also another trick that happened by "accident". I was getting him to bow one day and he started pawing. So I told him good boy Paw, and rewarded him. He gets better everytime.