According to the HOLLYWOOD HUCKSTER:
His wife was traveling to join him in LA from Boston. Her car broke down just outside an Indian reservation in a remote part of Arizona. Fortunately, a Native American on horseback came along and offered her a ride to a nearby town. She climbed up behind him on the horse and they rode off. The ride was uneventful, except that every few minutes the Indian would let out a “Y-e-e-e-e-h-a-a-a-a!” so loud that it echoed from the surrounding canyons. When they arrived in town, he let her off at the local service station. He yelled one final “Y-e-e-e-e-h-a-a-a-a!” and he rode off.
“What did you do to get that Indian so excited?” asked the service station attendant.
“Nothing,” the Huckster’s wife said. “I merely sat behind him on the horse, put my arms around his waist and held onto the saddle horn so I wouldn’t fall off.”
“Lady,” the attendant said, “Indians don’t use saddles.”