An oldie but a goldie

A man was in a hospital bed wearing an oxygen mask over his mouth. 

He mumbles, "Nurse, are my testicles black?" 

The nurse lifts his gown, holds his penis in one hand & his testicles in the other, takes a close look & says, "There's nothing wrong with them sir." 

The man pulls off the oxygen mask, smiles at her & says very slowly, "Thanks for that. It was lovely, but listen very very carefully... Are-my-test-results-back?"