Hmm, funny story? How's about just a little irony (an Indulgance is basically buying your sins away).
This happened back in the beginning of the Renaissance (1400s).
A robber had just robbed a rich man, and was running down the road when he caught up with a priest.
"Hey Priest" he said "How much will it cost to get an indulgence for the rest of my life?"
"It will cost you all the money you have." replies the priest. And so the robber hands over the money, and the Priest fills out an Indulgence.
The robber recieves the indulgence, and says "Thanks." He then pulls out a knife kills the priest and takes back his money and continues his life of crime, untouchable by the law...