watski's ball-gag

Bloke lying in hospital bed after an op. He has an oxygen mask on. Nurse asks if he's ok?

"Are my testicles black?" comes the muffled reply.

Nurse takes a look and says "hmmm let me massage them for you".

"Ooh thanks" he mumbles.

Next day another nurse asks him how he's feeling.

"Are my testicles black?" comes the muffled reply.

Nurse takes a look and says "hmmm let me massage them for you".

"Ooh thanks" he mumbles.

This goes on for four days until the first nurse returns and says, "OK I think it's time to remove your oxygen mask". She does this and asks him how's he's feeling, to which he replies:

"Are my test results back?"