He has stopped mugging already, for the most part.
Funny story, we had a training session where I was getting him to touch his bit, take it in his mouth (he has bit issues, long story). It was a pretty long, successful session. I turned him out afterward and was just standing on the fence watching him and the other horses. He came over to me and was looking for a target, when he didn't see that, he tried giving me kisses. No reward because I didn't ask. Then he BOWED. I sure didn't teach him to bow, someone else must have. It was very cute. I ran and got the clicker and treats and reinforced it. :)
"My treasures do not clink together or glitter; They gleam in the sun and neigh in the night."