Dojo challenges were huge years ago, when few people knew much about MMA and what it took to really know how to fight. All it took was someone who’d devoted years to his particular art of Blah-Blah style karate or Ding-Dong style of kung fu, an inflated ego and false sense of confidence, and then that cat would walk into a jiu-jitsu school and demand to fight the best.

Then he’d get his ass kicked.

Below is an example of that marvelous thing in action. Of course, we all know that Nathan Diaz went on to become a huge star and killer in the cage, but to me the most interesting thing about the video is that our boy Nate used to rock the Eminem hairstyle.