Two Old People

Two old people, a man and a woman, walk into a hospital. The doctor says to the old man:

"I'll need a urine sample, a feces sample, and a blood sample."

The old man says, "What?"

So the doctor says it again.

Once again the old man says, "What?"

So the doctor yells it, "I NEED A URINE SAMPLE, A FECES SAMPLE, AND A BLOOD SAMPLE!"

With that the old woman turns to the old man and says, "He needs a pair of your underwear!"