A 60-year-old man arrived at a Seattle hospital convinced his neighbor was poisoning him. Though medically stable at first, he soon developed hallucinations and paranoia. The cause turned out to be bromide toxicity—triggered by a health experiment he began after consulting ChatGPT. The case, published in Annals of Internal Medicine: Clinical Cases, highlights a rare but reversible form of psychosis that may have been influenced by generative artificial intelligence.Psychosis is a mental state ch...