"Are you sure it won't scream, or yell?" asked the preacher.
The storekeeper said"Oh, absolutely, it's a religious parrot. See those strings on its legs? When you pull the right one, he recites the Lord's Prayer, and when you pull the left one, he recites Psalm 23.
"Wonderful!" said the preacher, "But what happens when you pull both strings?"
The parrot suddenly screeched,
"I fall off my perch, you stupid fool!"