'Your Holiness, one of the Vatican nuns is pregnant,' a papal aide tells the Pope,'and what's more she says she's carrying the Messiah!'
'A pregnant nun? What a terrible scandal,' says the Pope, 'I guess we'll just have to ditch the bitch.'
'Holy Father, that might not be such a good idea,' the aide replies, 'Sister Immaculata insists she's carrying the Holy Seed, the second coming if you like.'
'And how in the name of heaven did she get that idea?' the Pope demands.
'Well, there's no easy way of explaining it...' the embarrassed aide says.
'Apparently she swallowed the first one.'