Insidious is a popular horror film franchise centred on supernatural hauntings and sudden suspense, which makes it a natural reference point for reaction sounds. Clips labelled as personal reactions to the films are commonly shared on soundboards and in short-form videos, where a single frightened response can stand in for the viewer's own experience. This type of sound stays useful because horror reactions are instantly recognisable, easy to drop into edits, and work just as well for genuine fear as for playful exaggeration.