A man goes to a pet shop looking for a unique bird. The clerk directed the man to a parrot and said, "This parrot is named Chester, and he sings Christmas carols."

The man says, "Christmas carols? I don't believe it."

The clerk replies, "I'll give you a demonstration". He then proceeds to pull a lighter out of his pocket, light it, and hold it under the parrots rear end.

With a loud sqwuak the parrot bursts into "CHET'S NUTS ROASTING ON AN OPEN FIRE!"