Place it at the exact reveal point in an edit, after a dun dun dun build-up and before a vine boom hit, then follow with an MLG air horn only if the scene cuts to a second, bigger reaction.
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A saturated alarm effect lasting about fourteen seconds, built from a blaring siren tone pushed into heavy distortion until it clips and buzzes. It feels overwhelming, urgent and deliberately absurd, like an emergency warning turned up far past sensible levels for comic shock.