Smart parrot

Fred at last could see a way of making a fortune. He had trained his parrot,
after month of hard work, to tell jokes.
At last he felt ready to cash in on all his hard work, and took the parrot down
to his pub.
"This is my incredible joke-telling parrot," boasted Fred.
"Go on," jeered the pub regulars. "We'll give you ten to one that your parrot
can't tell us a joke."
"All right," replied Fred. "I accept your bet."
But try as he could, Fred was unable to make the parrot talk, let alone tell
jokes.
On the way home Fred shook the bird and shouted: "What do you mean by
keeping quiet? You made me lose a ten to one bet!"
"Don't worry!" squawked the parrot. "Tomorrow you'll be able to get fifty to one."