David Lynch describes his first feature (1977) as “a dream of dark and troubling things,” and that’s about as close as anyone could get to the essence of this obdurate blend of nightmare imagery, Grand Guignol, and camp humor. Some of it is disturbing, some of it is embarrassingly flat, but all of it shows a degree of technical accomplishment far beyond anything else on the midnight-show circuit. With Jack Nance and Charlotte Stewart.