A little change
The patient shook his doctor's hand in gratitude and said:"Since we are the best of friends, I would not want to insult you by offering payment. But I would like for you to know that I had mentioned you in my will.""That is very kind of you," said the doctor emotionally, and then added, "Can I see that prescription I just gave you? I'd like to make a little change..."

Bottle of Evian water?
Q: Ever wonder about people who pay $2 for a bottle of Evian water?

A: Just spell "Evian" backwards!