Doctor: 'Have you been going out with men, Miss Jones?'

Miss Jones: 'Oh. no, doctor, never!'

Doctor: 'Are you quite sure? Bearing in mind that I've now examined the sample you sent, do you still say you've never had anything to do with men?'

Miss Jones: 'Quite sure, doctor. Can I go now?'

Doctor: 'No.'

Miss Jones: 'But why not?'

Doctor: 'Because, Miss Jones, I'm awaiting the arrival of the Three Wise Men.'