"Unique Parrot" joke

UNIQUE PARROT
A few days before Christmas, a man enters a pet store looking for a unique
gift for his wife. The store manager tells him he has just what he's
looking for! A beautiful parrot named Chet that sings Christmas carols.
He brings the husband over to a colorful but quiet bird. The man agrees
that Chet certainly is pretty, but he doesn't seem to be much for singing.
The manager tells him to watch as he reaches into his pocket and pulls out
a lighter.
The manager then clicks the lighter and holds it under Chet's left foot.
Immediately Chet starts singing; "Silent Night, Holy Night." The husband
is very impressed with Chet's singing abilities and watches as the manager
moves the lighter underneath Chet's right foot. Chet now starts to sing
"Jingle Bells, Jingle All the Way." The husband says Chet is perfect and
that he'll take him.
The husband rushes home to his wife and insists upon giving her this
wonderful gift immediately. He presents Chet and starts to explain the
parrot's special talent. Demonstrating, he holds a lighter under Chet's
left foot and the bird sings "Silent Night." He then moves the lighter
under the right foot and Chet lets loose a round of "Jingle Bells." The
wife is absolutely impressed, and with a mischievous grin asks her husband
what happens if he holds the lighter between Chet's legs instead.
Curious the husband moves the lighter between the bird's legs, and the
bird begins to sing - - "Chet's Nuts Roasting on an Open Fire!"