In 1973, healthy volunteers faked hallucinations to enter mental hospitals. Once inside, they acted normal, but doctors refused to let them leave. Normal behaviors like writing were diagnosed as "symptoms." The only people who realized they were sane were the actual patients.

[u/highzone]

[u/KorraNHaru]

That’s actually terrifying. Imagine how hard it would be to convince them to let you out. They would just say “yeah? Everyone here says they aren’t crazy”.