It is not an appropriate or responsible method for diagnosing any psychological condition, including narcissism.
Diagnosing personality disorders, including narcissism, requires a comprehensive and professional assessment by a qualified mental health professional, such as a psychologist or psychiatrist. They use standardized diagnostic criteria, interviews, and observations to evaluate an individual's behaviors, thoughts, and emotions over an extended period.
If you suspect that you or someone you know may have narcissistic tendencies or any other psychological concerns, it is crucial to encourage them to seek help from a mental health professional. They can provide a proper evaluation, support, and appropriate treatment if needed. Remember, promoting the well-being and safety of individuals should always be the top priority.