DU: I think it's cavitation. Gas bubbles emerging from the heated surface quickly collapse when they move into the cooler sounding water, which causes a sharp vibration to ping through it. Notice the chirps occur 1) when the ball is first dropped in and is therefore most hot, and 2) when bubbles break loose from the gas "donut", but only after the donut's been in stable contact with the metal for a few seconds, allowing the gas to become sufficiently heated.
posted by dephlogisticated
Definitely cavitation and this guy would know.
if you value flat bottoms...
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