Black Testicles?

A man is lying in bed in the hospital with an oxygen mask over his mouth and nose. He is still heavily sedated from a four hour operation.

A young nurse comes in to sponge his hands and feet.
“Nurse,” he mumbles groggily from behind the oxygen mask, “are my testicles black?”
Embarrassed, the young nurse replies, “I don’t know. I’m only here to wash your hands and feet.”
He struggles again to ask, “Please tell me. Are my testicles black?”

Finally, she pulls back the covers, raises his gown, holds his privates and jiggles them around a bit, takes a close look and says,”There s nothing wrong with them!”

Wearily, the man pulls off his oxygen mask and says very slowly, “That was very nice but listen very, very closely. Are… my… test…results…back?”