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We all know how nasty the fingernails-on-a-blackboard sound is.

What can I do to make a sound of this kind which is as loud and nasty as possible?

This doesn't have to involve any particular materials, just any equipment that is typically found in a home or high school science lab. (It has to be portable and non-electronic.)

  • I kinda suspect a fingernails-on-blackboard sound isn't nasty at all unless the listener knows what it is. I.e., focus on making the pictures as nasty as possible, not the sound. – leftaroundabout Jan 22 '15 at 21:52
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Fingernails are rather portable, and quite non-electronic.

Recording real nails on a real chalkboard, and then driving the most abrasive frequencies to near clipping would certainly have a stomach-churning effect.

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