A man in Amsterdam feels the need to confess, so he goes to his priest.

"Forgive me, Father, for I have sinned. During world war II, I hid a refugee in my attic."

"Well," answers the priest, "that's not a sin."'

"But I made him agree to pay me 20 guilders for every week he stayed."

"I admit that wasn't good, but you did it for a good cause."

"Oh, thank you, Father. That eases my mind. I have one more question."

"What is that, my son?"

"Do I have to tell him the war is over?"