A man entered a pet shop to buy a monkey. The shop owner pointed to 3 identical looking monkeys on a perch and said,

“The monkey on the left costs 500 dollars.”

“Why does that one cost so much?” asked the man.

The owner said, “That monkey knows how to use a computer.”

The man then asked about the next monkey and was told that this one costs 1000 dollars because it can do everything the other monkey can do plus he knows the Linux operating system. The man already asked about the third monkey and the owner answered,

“It costs 2000 dollars,”

The shopper was surprised, “What can it do?”

To which the owner replied, “To be honest I have never seen him do a thing but the other two call him Boss.”