My friend Pam related this to me yesterday. She and her guy Rob managed to fry the engine of their car.
A sunglass case on the console blocked the "OIL" light on the instrument cluster.
It had apparently been on for a couple of months.
The timing is even better: She had just taken the case to give to her kid so he could fidget with it, when she saw the light.
At just about that very moment, the engine started blowing up.