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"What happens in Vegas, stays in Vegas" phrase.
I happened to run across the origins of that phrase. It was actually what I recalled it being, an advertising phrase, popularized in TV commercials, paid for by the city of Las Vegas itself.
I couldn't recall the year it began, but recalled it was less than 20 years ago. It was begun in 2003, and the promotional campaign was actually conceived in 2000, but was delayed in its release, due to events of 9-11-2001, after which they thought it would be perceived as disrespectful to begin it after such a somber national event.
https://www.lyfepyle.com/phrase-origin-what-happen-in-vegas-stays-in-vegas/
