I was driving through NC, and as we crested a hill, I could smell burning brakes. A half mile or so ahead of us, there was a beat-up looking truck headed into the runaway lane. He went up, bled off all his speed, and then rolled backwards, jackknifed, and rolled. We stopped and I ran up to the truck. The guy was fine, as he crawled out, he was laughing the slightly hysterical laugh of a guy that just dodged death.
EDIT: for all of you asking where this is, I was wrong – it's actually Fancy Gap, VA.