Sister Bernadette and Sister Mary, two Irish nuns, are driving alone out in the boonies when they run out of gas. Fortunately, they are able walk to a gas station not far away, where they ask to purchase a can of petrol.
“I’m sorry, sister,” says the attendant, “I can sell you the petrol, but all I have for you to carry it in is an old chamber pot.”
The nuns agree that this will be ok, and return to their car. As they are pouring the gasoline into the tank, two farmers tilling the field across the road stop their labor and watch in amazement.
One says to the other, "Sure'n, Paddy, if what them sisters are doin' works, I'll never miss another Sunday mass again! "