 I got a mule, a dog-gone fool, he never pays no heed. I fill a fire and eat his tail, and then he shows some speed. Go on, mule, don't you roll them eyes. You can change a fool, but a dog-gone mule is a mule until he dies. Go on, mule, don't you roll them eyes. You can change a fool, but a dog-gone mule is a mule until he dies.