Zip-Line Catapult Stunt Will Make You Cringe [VIDEO]

How gutsy are you?  Why do I ask?  Take a look at this video, it's a bunch of young people jumping off a cliff on a zip line into the water. 

These people are nuts!  It looks like they are having a blast, but I don't know if I have the intestinal fortitude to jump off a 50 foot cliff and hope to make it safely into the water.  Take a look and let me know if you would do it?