The expert

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 expert