A minister is visiting the local zoo one day when, to his disgust and shock, he rounds a corner and sees a pair of gorillas mating. Outraged, he turns away, only to find himself face-to-face with a pair of rhinos, also mating. It seems that everywhere he turns, animals are breeding with wild abandon. Storming towards the exit, he crosses paths with a zookeeper, whom he confronts.
"You have to stop these shameful displays!" the minister bellows. "It's positively indecent!"
"Well, I don't know what we can do," the keeper explains. "The animals are just behaving naturally..."
"What they need is proper religious, moral instruction," the minister replies. "I will attend to it myself."
And so, every day for the next several weeks, the minister comes to the zoo and preaches to the animals, urging them to abandon sinful behaviors and live good, moral lives. Soon he can see the fruits of his labors; he visits the zoo to see the animals acting meek, mild, and modest.
Smiling with satisfaction at his teachings, the minister begins walking down the pathway to the exit, when he suddenly trips and falls headlong into the lion exhibit. Sitting up in a hurry, he finds himself in the middle of the entire pride of lions. After a second, he realizes that all the lions are bowing their heads in prayer.
"Well," he chuckles to himself, "at least these lions are now all good Christians."
At least, that was what he thought until he heard the lions' prayers: "Bless O Lord this meal which thou hast provided..."