A old man and his wife went to the doctor

An old man and his wife went to the doctor’s office and the doctor asked the man for a blood, urine, and feces sample.

The old man was slightly deaf and said, “What?”

Again, the doctor said, “I need a blood, urine and feces sample.”

The man still looked puzzled, so his wife leaned over and yelled into his ear:

“Sheldon, the doctor needs a pair of your underwear!”