Chetsnuts roasting on an open fire

Once upon a time a guy named Bob wanted to get his girl-friend a
gift for Christmas. He knew she loved birds so he went to a pet
store. He was looking in the bird section when he noticed that
he only had $20 bucks. Just then he saw a sign. It said
"Parrot only $20 dollars"
Bob went up to the counter and asked the guy behind it why the
parrot was only $20 dollars. "Well you see," the guy said, "this
parrot is really really old and only sings 2 songs. One if you
light a match under his left foot and one if you light a match
under his right foot." So then Bob went up too the parrot and
lit a match under his left foot. The bird started to sing
"Jingle Bells." Then he lit a match under his right leg. The
bird started to sing "Rudolph the red nose reindeer." Bob went
back to the counter and asked, "What's this birds name?"
"Chet," the guy replied. "Okay then what would happen if you
lit a match underneath Chet's balls?" Bob asked. "I don't know
I've never tried it."
So Bob went back to the bird and lit a match underneath his
balls. The bird started to sing "Chet's nuts roasting on an
open fire."