I’ll leave the explanation to Melissa over at Mboogiedown Japan who also posted these videos. But now I too will never forget the kanji for Naku. LOL.
Short Version: Kojima-san is a popular comedian on television now who’s shtick is saying “sonna
ni no kankei ne nai” while dancing around half naked. Need you any more explaination than that! No, didn’t think so. Enjoy!