Filmed in 1986 at a Maryland concert arena parking lot before a heavy metal show, this is an unvarnished, fascinating and Spinal Tap..esque anthropological study of American metal heads in their mid-'80s glory. A shed load of extras make up for the feature's 25 minute running time (though the bit with one now middle aged participant's exhaustive explanation of his record collection comes close to a cure for insomnia).