A man goes into a pet shop to buy a parrot. The shop owner points to three identical looking parrots on a perch and says, "The parrot on the left costs 500". "Why so much, " asks the man? The shop owner says, "He knows how to use a computer". The man then asks about the next parrot and is told that this one costs 1, 000 because it can do everything the other parrot can do plus it knows how to use the UNIX operating system. Naturally, the man asks about the third parrot to be told that it costs 2, 000.

Startled he asks, "What can it do?". The shop owner replies, "To be honest I have never seen it do a thing, but the other two call him boss!".