Halloween
In the seventies, mainstream horror movies were more supernatural than slasher movies. From “The Exorcist” to “The Omen” to “Carrie”, it too devils and demons to be scary enough for Hollywood to invest serious money into the genre. The “escaped lunatic” with a knife wasn’t enough. Films like that were relegated to the independent, low-budget filmmakers to spend a few hundred thousand dollars and hope to make it back in drive-ins and such.