A psychiatrist is doing his rounds with a couple of students. They look in on one patient, and the psychiatrist says to his students;

Sometimes this fellow thinks he's a temptress in a Bizet opera, but today, as you can see from his goose-stepping, he thinks he's the World War II head of the Luftwaffe. What condition do you think he's suffering from?"

The first student replies, is he a paranoid schizophrenic with a multiple-personality disorder?

The second student says, No, surely he just doesn't know whether he's Carmen or Goering.

If you must choose between two evils, pick the one you've never tried before.