We have one :). His name is Jack, he is enormous and the sweetest thing ever. He head (with ears) is over 3 feet long and he's 34 years old. You'd never know he was so old, he acts like he's twelve. We ride him on trail rides, in town, everywhere- he goes to Benson Mule Days every year!
I have one too. His name is Tiny and he is one part of a team that my dad had for many years. About 2 years ago, Buster (his mate) had to be put down due to arthritis but Tiny is still going strong. He is a smaller size for the breed, only about 17 hh but Buster was about 18.2. Very smart and very sweet. This coming from a woman who is really not a big fan of mules. LOL