Many may have seen this guy’s video on Youtube, probably this one “男女×ｳｻﾃｲ”
All of his video were originally from Nicovideo (a nice japanese youtube equivalent)
You may have seen this one – Hare Hare yukai ハレ晴レユカイ
HE still has many other, such as Caramel dansen ｳｯｰｳｯｰｳﾏｳﾏ XD
And this one, a perfect synchronization of human to CG or revers ?
I think they are funny strange, and some how make one keeps watching them lol