I've never understood why microwaves have an alarm that can't be disabled. They actually make me angry every time I fail to stop it manually at <10s.
Saved (fallible) me from a lot of cold meals.
My current microwave doesn't have that and in ascending order of silliness I have 1) forgotten food and eaten it cold 2) gotten hungry and gone to heat up something only to find there was something already in the microwave 3) (worst) opened the microwave to find something there from the night before.