Sorry. It's an old NHK TV programme (I should have been more clear). It was 5 or 10 minutes long and explored obscure Japanese vocabulary and grammar that even most Japanese people don't know.
BTW, the NHK web site has some interesting Japanese language resources. https://www.nhk.or.jp/bunken/research/kotoba/index.html
My google-fu isn't turning up anything with this title. Do you happen to have a link to the page?