Once upon a time there was a duck who wanted to rule the chicken coop so he told everyone in the barnyard that he was a chicken. He especially told the chickens that he was a chicken but they did not believe him. The horse refused to call him a chicken and so did the pigs. Now the sheep, who was the dumbest of the farm animals, he did not even believe the duck was a chicken.
Finally the duck asked, “What can I do to prove that I’m a chicken?”
“Do a chicken thing,” replied the cow. Since she was the smartest of the animals who roamed around the barn everyone agreed with her.
The duck thought for a moment then knew what he must do. He summoned the entire farm to meet him at the end of the lane. So it was that every animal gathered at the entrance to the farm where the duck stood proudly.
“Today, let it be known that I am a chicken,” proclaimed the duck. With that, he stepped out onto the road.
SMACK, a truck appeared out of nowhere and then vanished into the distance. To the surprise of the farm animals, the duck was gone.
One mile down the road, two startled men sat in the cab of a truck.
“What was that?” asked the driver.
The passenger stared intently out the front window. Feathers and little else remained of the duck. “Judging from the feathers," he said, "I’d say you hit a chicken.”
“What makes you think it was a chicken just from a few feathers?”
“Who else would cross the road to get to the other side?”
And so it was that the duck became a chicken.
Okay, well Calvin thought it was funny.