My elementary school had this thing, it was a big traffic light in the lunchroom with what sounded like a sports game buzzer on it. If we were "too loud" they'd blast the buzzer til we got quiet, and we wouldn't be allowed to talk for as long as the light was on red, which usually meant the rest of the lunch period. They pretty much gave us silent lunch every day cause kids are always loud. Idk how that shit was okay lol