Fan-filmed footage of Slipknot's set as the headliner for th Rockstar Energy Drink Mayhem Festival has been posted online, and can be viewed below.  Sadly, the multi-stop Mayhem festival kicked off without Slipknot guitarist Jim Root, who is recovering after his appendix burst several weeks ago.  According to reports, Root had been feeling ill for several days before going to the hospital, where doctors discovered the potentially life-threatening rupture.

Saturday's stop on the Mayhem tour took [place in San Berbardino, where a record 26,000 people showed up, surpassing the record of 22,000 for a Rockstar Energy Mayhem stop.