This is a case report of a woman with a long history of schizophrenia. She suddenly "confessed" that she had been feigning symptoms all along. Taken at face value, this statement caused a delay in antipsychotic treatment followed by a serious deterioration of the patient's mental state. It became clear over time that several components of the patient's experience of lying were delusional in nature. The diagnosis of schizophrenia was once again validated and antipsychotic treatment resumed. Doctors are advised to be very careful when basing clinical decisions upon suspicion of malingering.