While we can't say for certain what happened in this case, it certainly looks like a case of a driver not paying attention on the road. In this video from Dash Cam Owners Australia, we see a driver fail to stop in time and hit a van in front of them. The van violently flipped over numerous times, but thankfully, it appears that there were no serious injuries in this accident.
Next, it's not always on the road where you need to be paying attention. Sometimes trouble happens in your own driveway. One person was just unhooking the trailer hitch for their boat when it rolled downhill, much too heavy to stop. The boat hit a parked truck at the bottom of the driveway, causing $8,000 worth of damage to the truck. The boat was okay, so there's that!
via Viral Hog