I found a couple of these disturbing..

The guy trying to jump onto the truck bed 2:05 and the guy trying to jump on the giant bouncy ball 1:22 really made me cringe.

http://www.youtube.com/watch?v=pEOK9EQYeYc

Source: http://ninjashoes.net/forum/showthread.php?84079-I-found-a-couple-of-these-disturbing&goto=newpost

Ebenezer Fontes Braga Chris Brennan Marcelo Brito  Rob Broughton  Mike Brown