The fuming lawyer pays him and then comes back a week later determined to get back $100.
Lawyer: ‘My eyesight has become very weak I can’t see at all.’
Doctor: ‘Well, I don’t have any medicine for that, so take this $100.’
Lawyer (staring at the note): ‘But this is $20, not $100!!’
Doctor: ‘Congrats, your eyesight is restored. Give me $20.