Sonoluminescence is the emission of light from imploding bubbles in a liquid when excited by sound.

https://video.nostr.build/1d18a9d0c8e943a09c01b9b9d0702867ed6c8ad8411d3bcff2e963806caf4f42.mp4

...The mechanism of the phenomenon of sonoluminescence is unknown.

https://en.m.wikipedia.org/wiki/Sonoluminescence