This is what's called thinking on your feet

An older gent had an appointment to see a urologist who shared an office with several other doctors. The waiting room was filled with patients.

He approached the receptionist desk. The receptionist was a large imposing woman who looked like a wrestler. He gave her his name. In a VERY LOUD VOICE the receptionist said, "YES, I SEE YOUR NAME HERE -- YOU WANT TO SEE THE DOCTOR ABOUT IMPOTENCE, RIGHT?"

All of the patients in the waiting room snapped their head around to look at the very embarrassed man.

He recovered quickly though, and in an equally loud voice replied, "NO, I'VE COME TO INQUIRE ABOUT A SEX CHANGE OPERATION -- AND I'D LIKE THE SAME DOCTOR THAT DID YOURS."