A police officer was on the stand, being questioned by the defense attorney.
Attorney: You asked my client for his name, correct?
Officer: Yes.
Attorney: Then you asked him for his identification, correct?
Officer: Yes.
Attorney: Since he had already told you his name, why did you ask for his identification?
Officer: If I told you I was Napoleon Bonaparte, would you believe me?
This actually happened, back in the 70s. I was there, and the judge broke out laughing. I'm not sure the defense attorney ever got over that one.