You know that parable about "the man with ten coins in his pocket will get the job" about believing something true but without correct evidence? https://en.wikipedia.org/wiki/Gettier_problem
Me, flipping on the water kettle: I'll be back after this heats up.
My husband, looking at the microwave: nothing's heating up.
Me, coming back: huh? is it not plugged in?
My husband, looking at the microwave: well it's not running...
I look at the water kettle. It's not plugged in and not heating anything up.
@0xabad1dea You need a kettle with a bright LED to tell you it's on :)
@jernej__s it has a led in the base, I just did not specifically check because I did not expect it to be unplugged.
or a beeper that beeps when it turns on (and potentially off, too).