I just found this movie on YouTube. It’s not Lovecraftian, but it is frightening, suspenseful, and cruel. It’s the story of a man who wakes up in a box, and can’t get out. Other people come in and out, they even offer to let him go, but it never works. It’s an old concept, but I’ve never seen it more professionally rendered.
Here’s the really cool part. The movie was made by Jim Henson. This was something he did the very first year that Sesame street came on the air.
Anyway, here’s the YouTube Link. If I can find out how to buy it, I’ll post the instructions here.