There are many newsflash moments that are culturally significant, shared experiences even if the people hearing the news are nowhere near where the event took place. The idea of a newsflash—something so significant it would interrupt all normal broadcasting—goes back quite a while. It involves the railroad, Morse code, cannons, and drinking.
What's the Earliest Newsflash You Remember?
I think the Challenger disaster is the first I remember vividly, though the most significant was probably Kurt Cobain's death. I remember when the Berlin Wall came down, though it didn't mean much to me. What about you?