I remember seeing a movie in the theater as a child (say, mid-late-70’s-ish) and being disturbed by a scene in which two guys are fighting behind an x-ray screen. It was freaky. Fighting skeletons. And I recall there was a cat that got into it somehow, adding an also-freaky cat skeleton into the mix. (I’m sure it was actually not freaky at all, but it made quite an impression on me as a child and the image is rather burned into my brain.) But I’m not sure what movie it was. I thought it was Gus (the one about the mule that kicks the football), but it doesn’t really seem to fit.
Can anybody help me out here?