Two Porsches collide at triple-digit speeds, sending one barrel-rolling eight times. Then, an oil refinery explodes and sets off a shock wave felt more than a dozen miles away, and the worst flood in 40 years wreaks havoc on a historical city, including sending a torrent of water exploding through a storm wall. Finally, a snowmobiler crashes hard miles from the nearest hospital, and a bull rider's fall shows why this is rodeo's most dangerous event.