What does detonation sound like?

Craig Burriss said

From my experience, it sounds like pea gravel rattling around in a can.

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Light ping , sure does!.

Detonation...that sounds like a hammer smacking the piston top. No joke. Clack!
And after that noise, if hypers, the pee gravel sound comes back but the motor isn't running on anything but inertia due to the piston coming apart and wiping out a cylinder...