An out-of-towner swerved to avoid a squirrel, and his car slid into a ditch. Luckily, a local farmer came to help with his big, strong horse, "Buddy".
The farmer hitched Buddy to the car and yelled, "Pull, Nellie, pull!" Buddy didn't move an inch. Then the farmer hollered, "Pull, Buster, pull!" Buddy still didn't respond. Once more the farmer commanded, "Pull, Cocoa, pull!" Nothing happened.
Then the farmer said, "Pull, Buddy, pull!" The horse easily dragged the car out of the ditch. The motorist was most appreciative, but very curious, too. He asked the farmer why he had called the horse by the wrong name three times. "Animal psychology," the farmer explained. "If Buddy thought he was the only one pulling, he wouldn't even try."