Father Dave is out fishing with one of his parishioners, when he catches a strange fish. Asking his fellow angler what it is, he's surprised to hear that it's called a Fucker. Yes, yes, it sounds rude but it's the actual name and it's in books and everything. Mollified, he takes it home, after being told that they're delicious.
Visiting him that evening are the local bishop and a Mother Superior. Intrigued by the fish, they help him clean and cook it. When they ask what it's called, he says that it's a Fucker - no, no, please don't be embarrassed, here's a book explaining it all.
Anyway, as they're about to start eating, there's a knock on the door and in comes the Pope, on a surprise inspection. He joins them for dinner and asks what they have just eaten.
"It's a big fucker I caught in the river, your holiness" says father Dave.
"And I cleaned the fucker up" says the Mother Superior.
"And I cooked the fucker" says the bishop.
"You know something?" says the Pope, putting his feet up on the table and lighting a cigarette, "You cunts are alright!".