I once left a kind of breezy, fun out of office message for “people inside my organization” that said the literal truth: “I am out of office this week at a mountain resort where I have paid many hundreds of dollars for someone to take my electronics away from me. I’ll get back to you Monday,” and a very normal and professional OOO for “people outside my organization.” Needless to say I returned to a message from a senior (but not, I stress, my boss or even on my team) colleague calling me out on it. People surely can make things their business.
The Uniform Holiday Bill (Public Law 90-363 (82 Stat. 250)) was signed on June 28, 1968, and was intended to ensure three-day weekends for Federal employees by celebrating four national holidays on Mondays: Washington's Birthday, Memorial Day, Veterans Day, and Columbus Day. It was thought that these extended weekends would encourage travel, recreational and cultural activities and stimulate greater industrial and commercial production. Many states did not agree with this decision and continued to celebrate the holidays on their original dates.

“Ideally, an OOO should include the basics,” says work and wellbeing psychologist Kate Sullivan. “The dates you'll be gone, an approximate timeline for when someone can expect to hear back from you upon your return, and how any urgent requests will be handled in your absence.”
My old job was like that! It was so, so annoying. I understood requiring us to update our voicemails if we were out of the office that day, but it was just a waste of a few minutes every single morning.