I heard this story many years ago.
      Peter Kennedy,the great English BBC collector of folk songs,was recording waulking songs as the women worked.He was being very assiduous and serious about the opportunity extended to him and was making the assumption the meaning of the songs ,which of course he could not understand,was stuff like.....isn't this wonderful cloth,great catch of herring yesterday,looks like Morag is pregnant AGAIN etc.At a later date someone translated the words and they were saying stuff like "who's the twit in the old suit" " some stiff from London" and much worse.The singing was indeed impromptu !!
    I believe he told this story against himself. Nice story.