From a Yoshimoto Comedy Troupe stage show Yamasaki was in (same troupe company did the Spy batsu stage show). He and a couple of others break into dance suddenly. I decided to do a comparison video between their performance and Perfume doing the same dance on a live show. It cuts off at the end because throughout their dance, the other character on stage is understandably bewildered and repeatedly yelling at them until he finally gets them to stop (unfortunately, wish they had done the whole song!).
[video:kfyh02fv]http://www.youtube.com/watch?v=WeJfBhP1XcI[/video:kfyh02fv]