A veterinarian was feeling ill and went to see her doctor. The doctor asked
her all the usual questions, about symptoms, how long had they been
occurring, etc., when she interrupted him:
 
"Hey look, I'm a vet and I don't need to ask my patients these kind of
questions: I can tell what's wrong just by looking." She smugly added, "Why
can't you?"
 
The doctor just nodded.  "Well, I can probably do that, too."  He stood
back, looked her up and down, quickly wrote out a prescription, handed it to
her and said,  "There you are. Of course, if these don't work, we'll have to
have you put to sleep."