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Silverware scraping against plates.
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Styrofoam squeaking as you pull it out of a cardboard box.
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Saran wrap being scooted against a leather sofa.
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Nails digging into a chalkboard.
Do you really think the Military wouldn't have, at some point, done research in how to weaponize these things?
You're living in fantasy land if you don't think there's been plenty enough groundwork done under secret research programs to make something that can be used as area denial weaponry.
I'd go as far as to say that they've even found the Brown Note, of sorts.
If they haven't I don't doubt for a second they would still be throwing money at it as we speak.
Why wouldn't they? We know for a fact that the above phenomena are highly effective in making people's skin crawl. The obvious next step is to either make it covert and subliminal or overt and damn near drive people mad on exposure.
Havana Syndrome comes to mind, but I don't think it ends there.
I don't know how feasible this is, but they purport to have been attacked by 5G 'tusks' capable of causing symptoms of 'cooking' in the body:
http://www.human-resonance.org/microwave_attacks.html
My grey matter is insufficient to wrap itself round the science of this, I suspect you would have better luck.