Man in hospital bed wearing oxygen mask over his mouth.

"Nurse", he mumbles. "Are my testicles black?"

Nurse raises his gown, holds his penis in one hand & his testicles in the other, ... she takes a close look & says, "There's nothing wrong with them Sir."

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-re-sults-back...."