Kidneys and Livers
Two old men were arguing the merits of their doctors. The first one said, 'I don't trust your fancy doctor. He treated old Jake Waxman for a kidney ailment for nearly a year, and then Jake died of a liver ailment.'
'So what makes you think your doctor is any better?' asked his friend.
'Because when my doctor treats you for a kidney ailment, you can be sure you'll die of a kidney ailment.'