Parkour - Reap What You Sow

[LINK] http://www.youtube.com/watch?v=Bwrg7oAWVps (explicit language)

Everything explains it for me.  All I can say is that atleast most of the people here are hurt or injured to their extreme lack of experience.  Along with doing something they really should not be doing.  Here is a compilations of some BAD fails...