A woman walks into a pet store to buy a parrot. The seller offers her one, telling her that it can repeat everything it hears. Some days later the woman - feeling cheated - goes back into the store to get her money back. However, she comes back home with the parrot and not her money.
The parrot was deaf. It could not repeat anything, since it could not hear anything. However, the seller did not return the money to the woman because he never lied to her.