A boy was sitting on the street corner in front of a catholic church one day holding a bottle of turpentine. Then the pope came out and asked him what he had in his hands.
The boy replied, "This is turpentine, the most powerful potion in the world!"
Then the pope said, "I hate to dissagree with you boy but holy water is the most powerful potion in the world. If you put it on the belly of a pregnent woman then she will pass her baby right away!"
The boy said, "Well, if you put this on a cat's ass then it will pass a motorcycle!"