"Take a Bow" was the first (and only) trick I ever got around to teaching my pony George. He does it so well, in fact, that sometimes he'll bow without command to see if he can scam a treat!  

As far as horse tricks go, it is probably one of the easiest to teach, and it's a fun one to pull out to impress a new visitor.

Check out this video from Rick Gore of thinklikeahorse.org to learn how to teach your horse to bow!