Catacumbas

Brother Timothy: And I also managed to procure a pope's skull, just like the one in Brother Orsini's office

Brother Martino: Which pope is yours?

Brother Timothy: Why, Pope Paul the Eighth, of course.

Brother Martino: That's impossible; the one in Brother Orsini's office is the skull of Pope Paul the Eighth.

Brother Timothy: So? What's your problem?

Brother Martino: How can there be two skulls of the same pope?

Brother Timothy: Why bless you, it's perfectly simple. The pope's skull in Brother Orsini's office belonged to Pope Paul the Eighth when he was an 86 year old man; and mine is of Pope Paul the Eighth when he was only 65.

Brother Martino: Oh! I see.

Brother Timothy: Brother Martino, sometimes you are as slow as you are short.