This episode is one of my all-time favorites, from maybe my all-time favorite series. It's great from so many perspectives: lighting; minimal dialogue; sound editing; and Agnes Moorhead's terrific performance. The tension builds throughout this episode. Having seen it again very recently, I can assure readers that it stands up very well even after the passage of more than fifty years since the original airing. Seeing it again recently made me realize, and not for the first time, that a great writer and director don't need graphic violence and lots of screams to build terror and excitement. This is one of the can't miss shows out of the entire run of the series.