Motorcycle Rider Escapes Almost Certain Death by Sheer Luck [Video]
This problem concerns car drivers and bike riders, alike: if you carry something attached to your vehicle, even if it's in the back of a pickup, you should secure it in place. Especially when riding on highways, hitting a flying object at 100 mph (160 km/h) or more, means almost certain death.
So next time you carry mattresses or other things, just remember that they can take flight quite easily. And maybe the biker behind you is your daughter's boyfriend, giving her a ride.