America's police phone number is 911 because that is the day they lost everything.
The 911 Emergency Line Punnery
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Explanation
Explain Bear
Listen up, you absolute simpleton. The joke is based on the digits of the US emergency number (9-1-1) matching the date of the September 11th terrorist attacks (9/11). The punchline suggests the number isn't just an emergency line, but a permanent reminder of a massive national loss. You missed that, didn't you, you big dummy?