A doctor started having an affair with his nurse. Shortly after their affair began, she announced that she was pregnant.
Not wanting his wife to find out, he gave the nurse a large amount of money and asked her to go out of the country, to Germany, to wait out the pregnancy and have the baby there.
'But how will you know when our baby is born?' she asked.
'Well,' he said 'after you've had the baby just send me a postcard and write Sauerkraut on the back.'
Not knowing what else to do, she took the money and went off to Germany.
Six months went by and then one day the doctor's wife called him at his surgery.
'John, dear,' she said, 'you received a very strange postcard in the mail today and I don't understand what it means.'
'Just wait until I get home and I'll read it,' he replied.
Later that evening, the doctor came home and read his postcard. It said, 'Sauerkraut, Sauerkraut, Sauerkraut - two with wieners, one without.'