The ki ki ma ma motif comes from the original Friday the 13th film from 1980, where composer Harry Manfredini shaped the whispered syllables from the words kill and mom to suggest Jason Voorhees and his mother. It returned across the long-running slasher franchise and became a shorthand for an unseen killer approaching, long before short-form video existed. Today horror editors, gamers and prank creators reuse it because listeners recognise the pattern instantly, even without seeing the film, and a few seconds of that whisper can set up a jump scare.