A young boy witnessed the recent total solar eclipse. Being a very curious kid, he asked his dad if he could explain what causes the sky to darken during a total solar eclipse. His father replied, "No Son".
Arthur Mee once saw a level-headed business man solemnly gazing at a lunar eclipse through a piece of smoked glass. I'm not sure, but, the source of this could have been one of the pages in Hugh Percy Wilkins's book The Moon.