What's your earliest fire alarm memory?

[asdf1]

@randomperson

@Simplex 4051

…
I can never find the exact code-3 tone and message used for the system. I would know it if I heard any of them.

Could this be it (though it’s kinda hard to hear)? My current school has a Notifier system with this tone.
https://www.youtube.com/watch?v=vaeac76xKwU

That’s the most out-of-sync system I’ve ever seen