Invitation to Ruin

Saw this with a friend in high school at the famous Olympic Drive-in in St. Louis MO. (Obviously management wasn't too concerned about minors getting in). Don't remember this being the title, though, but who could forget Mama Lupo. Friend and I used to pass the drive-in every day on our way to Normandy High School on the bus. Two award-winning titles I remember were "Sexus" and "Ouija Broad". We always got a big laugh. The view of the screen from the road was blocked by huge plastic tarps which inevitably were blown down or shredded in strong winds, permitting a peak at the action as you drove by.