Black testicles

A male patient is lying in bed in the hospital, wearing an oxygen mask
over his mouth and nose, still heavily sedated from a difficult four
hour, surgical procedure A young student nurse appears to give him a
partial sponge bath.
Nurse', he mumbles, from behind the mask 'Are my testicles black?'
Embarrassed, the young nurse replies 'I don't know, Sir. I'm only here
to wash your upper body and feet.'
He struggles to ask again, 'Nurse, are my testicles black?'
Concerned that he may elevate his vitals from worry about his
testicles, she overcomes her embarrassment and sheepishly pulls back
the covers.
She raises his gown, holds his penis in one hand and his testicles in
the other, lifting and moving them around.
Then, she takes a close look and says, 'There's nothing wrong with
them, Sir !!'
The man pulls off his oxygen mask, smiles at her and says very
slowly, 'Thank you very much. That was wonderful, but listen very, very
closely......
A r e - m y - t e s t - r e s u l t s - b a c k ?