Fun Fact #1: my sister once stopped the microwave at 0 seconds. It didn't finish so the beeper never went off.
Fun Fact #2: I'm not sure how many can do this but if you hold the microwave door open Just past the fully closed point (basically just close it and very gently pull on it) if you get it In the right position the microwave will activate. I believe it does not heat up but the light and the spinning parts will activate.