Kojima Yoshio and his "Sonna No Kankei Ne" dance routine makes Japanese kids go Wild

For the past two months, the kids at my school have been really difficult. Every five minutes, one of them will get up and do some dance and song that involves bending down and making punching motions at the floor. Whenever one kids does it, a few other kids start laughing uncontrollably and then they get up and do it too. I thought it was some song they learned at school or a routine from their drama class until just the other day when I was biking home and saw two high school girls doing the motions and singing the song and laughing hysterically.

So I googled the words to the 'song', which is a Japanese comedy routine with "Sonna no kankei ne" repeated, and by only looking for that phrase, I easily found the comedian called Kojima Yoshio and found out that he's super popular. Look him up on Youtube. He's famous for wearing a speedo and doing this weird little dance. "Sonna no kankei ne" means something like "I don't think it matters" (according to my pitiful Japanese... please correct me if I mis-translated it) and he is so popular with both elementary and high school kids. Here is his real routine from Youtube.
Here is a small example of how popular he is with Japanese teenagers. In this clip, a bunch of schoolgirls do his "Sonna no kankei ne" dance routine. This little guy looks around the same age as the kids I teach here in Tokyo, and this kid has the same amount of energy as mine have. Yoshio Kojima is the cause of total delight for thousands of Japanese children and the cause of total frustration for thousands of parents and teachers. ...but I still think he is kind of funny.