"Rumble on the Road; The Trouble with Hobbies" is a Mandrake story where a horse named Blue, owned by Herkimer Hobbs, plays a key role. Hobbs has a peculiar hobby of testing old sayings. When he tries the proverb "You can lead a horse to water, but you can't make it drink," Blue discovers a package in the water. A shooting ensues, and Blue flees with the package to Xanadu, with Mandrake in pursuit
