Something popped into my head from many many moons ago when I was in grade school. Around Halloween the school would roll a reel (yes an actual film) called, "The Creeps Machine". It was a vignette based movie in which was centered around a hideous machine that when certain knobs and levers were moved a new vignette played. Basically it was the predecessor to Creepshow.
I don't remember much from it, but one thing I remember clearly was that a hideous hand came out from a little door on the machine and turned a rather large knob. I remember the whole classroom (well mostly the girls) were screaming.
I am going out on a limb now as this film was from the 70's. I am curious if anyone else has seen it.
Edit. OK, we have a bingo. I was off on the title by one letter. I called it The Creep Machine when it is The Creeps Machine. Special thanx to Theundeadofnight And Nocturnaloner for figuring this out.
Here is a clip from it: