One day a man goes to a pet shop to buy a parrot. The assistant takes the man to the parrot section and asks the man to choose one. The man asks, ”How much is the yellow one?” The assistant says, ” 2000.” The man is shocked and asks the assistant why it’s so expensive. The assistant explains, ”This parrot is a very special one. He knows typewriting and can type really fast.” ”What about the green one?” the man asks. The assistant says, ”He costs 5000 because he knows typewriting and can answer incoming telephone calls and takes notes.” ”What about the red one?” the man asks. The assistant says, ”That one’s 10,000.” The man says, ”What does HE do?” The assistant says, ”I don’t know, but the other two call him boss.