If Richard O'Brien, writer of the "Rocky Horror Picture Show", wasn't inspired to write his movie after seeing "Horror Hospital" I'd be very surprised. So many similar subjects: sexually active couple in old castle/mansion, leather clad bikers, gore, evil doctor, brain manipulated minions. Even the couple's arrival is almost a carbon copy of Brad and Janet's greeting by Riff Raff who is in this case a freaky dwarf (pc - little person). This movie was released in 73' which would have been just a year before he began the songs for his soon to be musical "Rock(y) Horror Show." This is a must see for any RHPS fans.