One day he goes to a shop. He wants to buy a parrot.
He says to the shopkeeper, “D-d-do you have a p-p-parrot?”
“Yes, sir,” answer the shopkeeper, “Here is a fine green one. It understands everything.”
So John buys it and goes home with his bird. But some days later he takes it back to the shop.
“This b-b-bird can’t t-t-talk,” he says, “It can only st-t-tammer.”