This is a case report of a 24-year-old woman, who was well-known in psychiatric departments with a personality disorder and anxiety, and who was admitted to a psychiatric department due to acute global amnesia. She answered all questions with: "I don't know" or "I don't remember". She did not have any other symptoms, no head injury, drug abuse nor signs of somatic disease. Four days after the symptoms initially occurred, they showed full remission without any other particular intervention than hospitalisation. She was diagnosed with dissociative amnesia.