Of all the "Thriller" episodes, this is the definitive one. I saw the first broadcast of this in the early sixties. I was twelve years old. I was never so frightened, by any other television show, as I was by "The Hungry Glass". I have never been so frightened by one to this day. The "headless ghost" episode of "Alfred Hitchcock Presents" was scary...REALLY scary...but not like this. I recall my mom telling me, the next morning, that she read in the newspaper, that a number of children, nationwide, had to be taken to hospitals, for calming, after watching it. This was at a time when "Psycho" and the Barbara Steele film, "Black Sunday", were new. Like this, they were in black and white...but, that didn't matter in the least. That didn't stop them from being scary. Horror movies weren't dependent upon gore and graphic violence to scare the wits out of an audience back then. The build-up, artistic cinematography, and psychology of the tale were enough to do it. The genre seems lost, however, and there is nothing, nowadays, to compare. I don't use spoilers, myself, but I will say that the whole of the story is engrossing. It builds to one of the most effective climaxes that I have ever witnessed on film. If you watch this one, be sure that you don't get pulled in.