In all seriousness, what kind of stuff could actually have you be locked up on a mental facility in the US?
If you’re a danger to yourself or others, police can detain you with an APOWW, which stands for Apprehension by a Police Officer Without a Warrant, and hold you until you are deemed safe at an “appropriate” mental health facility. (Most of these places are horrible tbh. Usually filled with the homeless and genuinely mentally ill/unwell people). Back in my EMS days I would dread running calls to these places.
Dunno if there are many left in the US but if you answer the question they always ask:
“Do you feel like hurting yourself or others?“
With a “yes” they can recommend you get wrapped up “for your protection” for a short while. Then bill you of course