The pope is arguing with an atheist about the existence of God. After an hour of being unable to get his adversary to change his mind, the pope becomes exasperated and angrily exclaims,
"You are like a blindfolded man, wandering round a dark room looking for a black cat that isn't there".
The atheist replies,
"With respect, your holiness, you too are like a blindfolded man, wandering round a dark room looking for a black cat that isn't there. Only you've found it".