Composer Harry Manfredini created the whispered motif for Friday the 13th in 1980, shaping the sounds ki from kill and ma from mom into a chilling musical signature for the film's killer. Although it first accompanied Pamela Voorhees, later sequels and pop culture tied it firmly to Jason Voorhees and Camp Crystal Lake. Horror fans, meme makers and video editors have kept it alive in trailers, parodies and Halloween clips because two seconds of that whisper instantly signals danger before anything happens on screen.