Three different wingsuit pilots have survived unintentionally crashing into trees with no parachute out now:
https://www.youtube.com/watch?v=kp3YLdhraPw
https://vimeo.com/50817449 (view at 6:35)
http://www.basejumper.com/cgi-bin/forum/gforum.cgi?post=2994...
And then you have Jeb Corliss crashing full speed into a mountain and surviving: