Had a friend who managed to "loose it" on a curve that was a bit tighter than he expected. He was doing about 150 klicks at the time and miraculously slid between the trees and walked away unscathed. His bike was not so lucky and impacted with several solid gum trees. Some bit of it finished up hanging in the branches 30 feet up.
His friends who were with him at the time could not believe he only had a few scratches and bruises.
I have seen the photos so I can be sure it was not just a good story.