Just FYI this is authentic.
Check out these two sites, the latter being the actual flickr profile of the photographer that took them
Authenticity:
http://www.truthorfiction.com/rumors/g/gcdaredevil.htm
Flickr:
http://www.flickr.com/photos/hansvan...7594222213140/ EDIT Truth be told
:
http://www.snopes.com/photos/natural/canyonleap.asp
I still think it is dangerous