It is an old story, but a good one. Former baseball manager Billy Martin told it in his autobiography titled Number 1. He says he and Mickey Mantle were doing a little hunting down in Texas. Mickey had a friend who would let him hunt on his ranch. When they got there, Mickey told Billy to wait in the car while he went in and cleared things with his friend. Permission was quickly granted for them to hunt, but the owner asked Mickey to do him a favor. He had a pet mule in the barn who was going blind and he didn't have the heart to put him out of his misery. He asked Mickey to shoot the mule …