The recording behind this clip is not credited on the soundboard, and it is shared simply as a short scary violin sound. That lack of a named source has not stopped it spreading, because creators recognise the style at once from horror films and television, where high, sliding strings signal danger. Online it is used as a quick shorthand for fear, in the same way as a dun dun dun sting, for jump scares, creepy reveals and Halloween edits. Its popularity comes from that recognition, letting a creator add suspense in under a second.