Off-Topic :
Fairfax Underground
Welcome to Fairfax Underground, a project site designed to improve communication among residents of Fairfax County, VA. Feel free to post anything Northern Virginia residents would find interesting.
Interestingly (or not, your mileage may vary), the sound from the Friday the 13th movies was actually the composer, Harry Manfredini, saying the syllables "Ki" and "Ma", from the words "Kill" and "Mother", with a heavy reverb echo effect.
So, if you think about it, in the first movie, the composer was actually giving away the twist in the final denouement all throughout the film.