This reminded me of:
,The barber says, "Father, you're a holy man, a man of the cloth, I couldn't charge you, it's on the house."
The priest says, "Thank you very much" and leaves.
The next day, magically appearing on the doorstep of the barbershop are 12 gold coins.
A few days later, a minister goes in for a shave and a shine, and when the time comes to pay the barber says, "No money, please, you're a spiritual leader, a man of the cloth. It's on the house."
The next day, magically appearing on the doorstep are 12 rubies.
The following week a rabbi comes in, gets a haircut, goes to pay, and the barber says, "No, rabbi, you are a learned man, a wise man. I can't take any money from you. Go in peace."
And the next day, magically appearing on the doorstep of the barbershop are 12 rabbis. '