Every Human Being currently alive on this Earth will hear it, somehow, at the same time.
You may say ONE sentence, following American English grammatical rules as what classifies as a sentence.
What would you say?
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"-blam!- you all!" or maybe "MURICA -blam!- YA!" or maybe... (a couple more or maybes) "ALL YOUR BASE ARE BELONG TO US" or maybe "STAHP FIGHTING NAOW!" or maybe "Nukes are the answer or maybe "CATS, EVERYONE NEEDS A CAT!"