A nun is driving her (well, the convent's) car through some very lonely country side. The car stops and she notices there is no gas left. So she walks to the nearest filling station. Of course, being a nun, she is a little unworldly so she forgot to take along the canister for the gas.

The guy at the filling station has no canister either. He thinks for a while and then hands her a bed pan full of gas. The nun walks back to her car and starts pouring the gas into the tank.

A passing car stops and the driver looks out and says, "Sister, how I would love to have as much faith as you do!"