Filmed in 1986 at a Maryland concert arena parking lot before a heavy metal show, HMPL is an unvarnished anthropological study of American metalheads in their mid-'80s glory. It is the quintessential '80s magnum opus, made complete with a vast display of muscle cars, spandex, bleach-blonde frizzy perms, bare-chested dudes, Mullets from Hell, faded denim metal chicks, and the largest collection of late '70s Camaros ever seen in one location.