A woman entered the hospital to deliver her 15th child...
A woman entered the hospital to deliver her 15th child. "Congratulations," said the nurse, "but don't you think this is enough?" The woman replied, "Are you kidding? This is the only vacation I get each year."

An invisible man is here to see you
Nurse: Doctor, there is an invisible man in your waiting room.

Doctor: Tell him I can't see him now. Next.