One day a preacher went to a pet shop to buy a parrot. When he finally made his choice, he asked the shop assistant,
«Are you sure it doesn’t scream, yell or swear?»
«Oh, absolutely. It’s a religious parrot,» the shop assistant said.
«Do you see those strings on its legs? When you pull the right one, it recites the Lord’s prayer, and when you pull the left one, it recites the 23rd Psalm. »
«Wonderful!» said the preacher. «I’ll buy it. By the way, what will happen if I pull both strings?»
«I’ll fall off my perch, you stupid fool!» cried the parrot.