Off-topic weird:

My sweetie called me into the kitchen to track down the source of a noise that sounds like an electric razor (we don’t own one).

Put my ears around the kitchen and tracked the source to the percolator, in which she just perked a pot of coffee.

I moved the percolator to another burner that wasn’t hot and the noise stopped. Apparently the still-warm burner was warming coffee at the bottom in such a way that the rising coffee going around the percolator basket was making the noise.

I need a physicist like Neil DeGrasse Tyson to weigh in on this for me. /s