At the doctor’s office

A lady came in for a routine physical at the doctor’s office. “Here”, said the nurse, handing her a urine specimen container. “The bathroom is over there on your right. The doctor will be with you in a few minutes.” A few minutes later the lady came out of the bathroom with an empty container and a relieved look on her face. “Thanks! But they had a toilet in there, so I didn’t need this after all!”