I always thought I was weird for not ever letting the microwave beep when it ends. I always open the door a second before it ends. Sometimes you'll see me running across the house just so I can turn it off before that annoying beep. But then I started working at a co-working space, and I see a sticker on the microwave that says "Be kind, open the door before it beeps".
Haha, just last night I noticed my daughter does that.
I waited next to her until it was about to beep then knocked her arm out of the way so she missed the perfectly-timed door opening and the microwave beeped its hideous beep.