"Parrot" joke

So there's this fella with a parrot. And this parrot swears like a sailor, I
mean he's a pistol. He can swear for five minutes straight without repeating
himself. Trouble is, the guy who owns him is a quiet, conservative type, and
this bird's foul mouth is driving him crazy.
One day, it gets to be too much, so the guy grabs the bird by the throat,
shakes him really hard, and yells, "QUIT IT!" But this just makes the bird mad
and he swears more than ever.
Then the guy gets mad and says, "OK for you." and locks the bird in a kitchen
cabinet.
This really aggravates the bird and he claws and scratches, and when the guy
finally lets him out, the bird cuts loose with a stream of invective that
would make a veteran sailor blush.
At that point, the guy is so mad that he throws the bird into the freezer.
For the first few seconds there is a terrible din. The bird kicks and claws
and thrashes. Then it suddenly gets _very_ quiet.
At first the guy just waits, but then he starts to think that the bird may be
hurt. After a couple of minutes of silence, he's so worried that he opens up
the freezer door.
The bird calmly climbs onto the man's out-stretched arm and says, "Awfully
sorry about the trouble I gave you. I'll do my best to
improve my vocabulary from now on."
The man is astounded. He can't understand the transformation that has come
over the parrot.
Then the parrot says, "By the way, what did the chicken do?"