Peace in the Middle East
An old Jew and an old Muslim come to pray together every day, first at the Western Wall and then at the Dome of the Rock in Jerusalem.
They pray fervently for about an hour at each location and then go home.
This happens for years.
Finally, somebody asks them what they are praying for.
They answer: "Lasting peace and understanding in the Middle East."
So they are asked if they think their prayers will ever be answered.
The Jew responds: "It's like talking to a wall."
The Muslim responds: "It's like talking to someone with a heart of stone."