Are my testicles black

A man just got out of surgery and was still in the hospital lying in bed with a breathing machine attached to his mouth. A nurse walks in and checks the breathing machine and makes sure every thing is functioning correctly.

The man says, "Excuse me, nurse. Are my testicles black?"

The nurse looks confused and says, "Excuse me?"

The man says again, "Are my testicles black?"

So the nurse pulls down the covers of the bed, lifts the man's hospital gown and carefully inspects his testicles. When she's done she says, "Nothing seems to be wrong with them and they're definitely not black."

The man smiles, pulls the breathing machine away from his mouth and says, "Thank you, that was nice, but I was asking 'Are my test results back?'"