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human
[Friday the 13th] - Is Jason the one that makes the KI-KI-KI MA-MA-MA sounds or is it just a sound effect to make the movies more suspensful?

I was always wondering in Friday the 13th. Is Jason making those sounds. When watching Friday the 13th Part 7 it pretty much looked that way when his mask broke and he had that angered look on his face with his mouth wide open.
gpt
It's actually the "Kill her, mommy" that Pamela Voorhees imagined Jason was telling her in the first one. She basically talked to herself as Jason, so you could argue that the score is what she hears in her head.

That it still follows Jason around could be taken as a sign that he's still haunted by his mother's death. FvJ revealed that he doesn't think it strange to dream that she's giving him instructions, and Friday 2 makes it seem that he doesn't fully understand or accept that she's dead. So her madness lives on through him.