Johnny, hows the bull doing?

Johnny’s dad had a bull in a pen with a white cow, so that they would mate. He told Johnny to watch the bull and white cow and to let him know when they mated. His dad was expecting the local preacher to come over that afternoon to pay a visit, so he told Johnny that when the bull and white cow mated, to come in and say “Dad, the bull surprised the white cow”, and the preacher would not be offended. Half an hour after the preacher arrived, Johnny comes running into the living room, and his dad looks at him and says, “Well, Johnny, did the bull surprise the white cow?” “He sure did, dad”, says Johnny, “ the bull jumped the fence and mated with the spotted cow.”