The chopped hog came roaring over the hill like a black streak of motorized lightning. The grungy-looking rider’s tangles of blond hair streamed over his shoulders as he clung to the ape-hangers of the big 1200. Even as fierce winds clawed at him, threatening to pluck him from his seat, he laughed hysterically, cutting in and out of both lanes, hooting like a mad owl. A short distance ahead of him coming in the opposite lane a yellow school bus trundled along the highway running between the small towns of Crete and Sprague in lower Nebraska