The bug
If you build the clock circuit below (make sure to place the redstone at the top right last), you'll hear one burn out sound (which is an actual burn out), then another (also an actual one), then you'll hear tons and tons of sounds even though the redstone torches aren't burning out.
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Can confirm for MC 1.12.1.

This bug has been fixed.

Can still reproduce in 1.16.1 and 20w28a.
Can confirm in 20w48a.

Confirmed for 1.16.5. The sound is mislabeled as "Torch fizzes" (testing this bug discovered MC-218415). It also makes particles even though it shouldn't.

I can confirm this in 1.21 and attached a video demonstrating the bug.
[media]
that is creepy and cool at the same time