This is a joke that I find hilarious everytime I read:

A man received a parrot for his birthday. This parrot was fully-grown with a bad attitude and worse vocabulary. Every other word was an expletive. Those that weren’t expletives were, to say the least, extremely rude.
The man tried hard to change the bird’s attitude and was constantly saying polite words, playing soft music, anything that came to mind.
Nothing worked. He yelled at the bird, the bird got worse. He went to a voodoo spell caster to cast a binding spell on it, with no luck.
He shook the bird and the bird got more angry and exceedingly rude.
Finally, in a moment of desperation, he put the parrot in the freezer.
For a few moments he heard the bird squawking, kicking and screaming and then, suddenly, all was quiet.
The man was frightened that he might have actually hurt the bird and quickly opened the freezer door. The parrot calmly stepped out onto the man’s extended arm and said: “I’m sorry that I offended you with my language and actions. I ask for your forgiveness. I will try to improve my behavior.”
The man was astounded at the bird’s change in attitude and was about to ask what changed him when the parrot continued, “…May I ask what the chicken did?”