A man made an appointment with a clinical psychologist and explained his problem. "I think I'm a schizophrenic with multiplepersonality disorder. Some days I believe I'm a temptress in a Bizet opera, others days I'm convinced that I am the head of the German Luftwaffe in the Second World War." The psychologist listened patiently before concluding: "Well, it seems to me that you don't know if you're Carmen or Goering."