In 1973, eight healthy people feigned a single hallucinatory symptom(spacedaily.com)

https://spacedaily.com/k-in-1973-a-stanford-psychology-professor-sent-eight-healthy-people-into-twelve-psychiatric-hospitals-with-instructions-to-feign-a-single-hallucinatory-symptom-then-act-normally-in-an-experiment-that/