Assassination of Franz Ferdinand
The phrase "shot heard round the world" (alternatively "shots heard round the world" or "shot heard around the world")[2][3] has also become associated with the assassination of Archduke Franz Ferdinand of Austria in Sarajevo on 28 June 1914, an event considered to be one of the immediate causes of World War I.
https://en.wikipedia.org/wiki/Shot_heard_round_the_world#Assassination_of_Franz_Ferdinand
Or the phrase points to a future assassination attempt on someone…
Missle?
Watch the water?