Completely unsympathetic to his nymphomaniac clientele, Johnson keeps the drive in open. The next night, a married man and his mistress are getting it on in their car when our maniac from the morality police shish-kabobs them with a sword. The detectives now consider Johnson a suspect, too. Apparently Johnson was also a sword-swallower, before he became a barker at that same carnival. The plot thickens as our detective duo (see picture below) identify a peeping-tom who was seen near the cars in which the couples were murdered. After interrogating Johnson, one detective remarks, "They may have closed the carnival, but the freaks are still hanging around, and we just talked to the choicest one." As our conclusion approaches, the detectives go undercover at the drive-in, and of course, our killer also shows up.
Some suggest the Peter Bogdanovice film "Targets" (Boris Karloff's final film) inspired "Drive In Massacre." However, the ending just oozes of William Castle films. Directed by Stu Segall, this film sought to involve the audience in the film...a la William Castle's "The Tingler." After seeing the movie, I couldn't wait to go back to school on Monday and tell all my friends about it. When describing the kills to my friends in home room, for the only time in my junior high school career, I had everyone's attention.