Two blokes are chatting in their hospital beds. 

'What are you in for?' says the first.

'Camera down the throat', the other replies.

'Oh, endoscopy?' the first man asks.

'Yes', he says. 'Checking for stomach cancer.' What about you?

'Camera up the back passage', he says.

'Oh, colonoscopy, checking for bowel cancer?' quizzes the second man.

'No, my extremely voluptuous closely shaven next door neighbour was sunbathing nude and my wife caught me taking a photo'