Pope John Paul II went on a Papal trip to Australia. He came to visit an Aboriginal community. He met an aboriginal person and asked him if he would like to become a Catholic.
The aboriginal replied yes so the Pope took him to nearby river to baptise him. He dipped the aboriginal's head into the water three times and said to him, "You're now a Catholic" each time the head came out.
The aboriginal asked the Pope if he could bring the rest of the tribe to become Catholics and the Pope replied, "No problem at all. I can baptise them all in one day. So the next day, the rest of the tribe came to the river and the Pope did exactly what he did to the first aboriginal to each member of the tribe.
After a day of baptising, the Pope explained to the tribe adout all the rule of Catholicism ie sign of the cross, praying, going to mass, reading the bible etc and said the them the next day, "I have to go back to the Vatican and I have one thing to tell you before all I leave. Now that you're all Catholics, you're not allowed to eat meat on Fridays, bit you are allowed to eat fish on those days. Ok? Goodbye. See you next time." The Pope left
Three years later, the Pope returned to Australia for a conference, but he had time to visit the aboriginal community that he baptised three years ago.
He asked the aboriginals, "Have you been following what I told you about not eating meat on Fridays?". The aboriginals replied, "Yes, John Paul".
The aboriginals like eating kangaroo's tails, so one of the members of the tribe showed a kangaroo's tail to the pope and asked him, "Excuse me, John Paul, is this considered meat?". The Pope replied, "Yes. It is a meat and you're not allowed to eat it on fridays."
The aboriginals didn't know and thought to themselves without saying a word, "Oops... We're in trouble".
One of the other aboriginals came up with an idea. He said, "We are allowed to eat kangaroo's tails on fridays now because I can take it to the river, do exactly what John Paul did to me, but instead I'll say, "You're now a fish. You're now a fish. You're now a fish."