So Expensive Parrots

Once a man went to buy a parrot.....

Man: These parrots seem nice, but show me the best and healthy ones....

Shopkeeper: Sure sir, I have three best parrots.....

Soon the shopkeeper brought those 3 parrots.....

Man: How much each of them costs...??

Shopkeeper: The 1st parrot costs 1000$, 2nd parrot costs 2000$ and the 3rd parrot costs 5000$.

Man: That's interesting, but why so expensive....??

Shopkeeper: The 1st parrot can speak many languages and even knows about Windows XP.....

Man: Wow...What about the second parrot...??

Shopkeeper: Well he also knows many languages, plus he knows some things about Windows XP and Linux Operating System....

Man: That's amazing....What ­ about the 3rd one...Why he costs $5000....?? Which languages he knows...??

Shopkeeper: Well, frankly speaking, he just fires bad words and doesn't know anything, but the other two parrots call him"BOSS......!!"