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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.)

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  • 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. Commented Jan 22, 2015 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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