Student Bodies

Student Bodies is a 1981 comedy film written and directed by Mickey Rose, with an uncredited Michael Ritchie codirecting. A spoof of slasher horror films such as Halloween, Friday the 13th, and Prom Night., Student Bodies was the first film to satirize the thriving slasher film genre. A prominent feature of the film is a body count that is superimposed onscreen whenever a death occurs.

The Breather enjoys stalking victims over the telephone and much like Jason Voorhees of the Friday the 13th films, he hates seeing youngsters having sex. The Breather uses many unusual objects to kill his female victims such as a paper clip, a chalkboard eraser, and a horsehead bookend. He kills his male victims by placing them in trash bags alive.The film itself ends with several twists initially, it is revealed that the Principal and his elderly female assistant are working as a duo as The Breather, even though they are shown at one point in the film in the same room as other characters when the Breather contacts the school to threaten to commit further murders. The film then goes to reveal that the entire film was a fevered dream, caused by the main character Toby being sick and consumed by overwhelming sexual repression. In a sendup of The Wizard of Oz, many characters are revealed to be much the opposite of what they appeared to be for the bulk of the film the jocklike shop instructor is really the schools French teacher, the stuckup wouldbe prom queen is actually the school nerd who is given the crown by Toby after she wakes up, due to her kind nature, the two handicapped kids turn out to be noncrippled, and a local ROTC cadet is a hippie. ........

Source: Wikipedia