This is a joke meant to get some laughs: There is John and Shirley. John and Shirley both own racehorses, and they can't tell them apart. So, John suggests to Shirley, how about if I cut my horses mane, and then we will know that the horse with the shorted mane is my horse. So Shirley says yes this is a good idea, and it worked for awhile, until John's horse's mane grew back, so the Shirley says, why don't I cut my horse's tail short and then we will know that my horse has the shorter tail? So John agrees that this is a good idea, and it worked for awhile, until Shirley's horse's tail grew back. So now they asked a blonde and the blonde came up with a solution: measure the horses and see who's is the tallest. This worked! Now they knew that Shirley's black horse was bigger then John's grey horse.