A priest goes into a barbershop, gets a haircut, thanks the barber and asks
how much he owes him. The barber says, "Father, you're a holy man of the cloth,
I couldn't charge you, it's on the house." The priest says, "Thank you, my son,"
and leaves.
The next day, magically appearing on the doorstep of the barbershop are 12
silver coins. A few days later, a Sheik goes in for a trim, and when the time
comes to pay the barber says, "No money, please. You're a spiritual
leader, a man of the people, it's on the house." The Sheik says, "God bless
you," and leaves.
The next day, magically appearing on the doorstep are 12 gold coins. 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."
The next day, magically appearing on the doorstep of the barbershop are 12
Rabbis!