One of my favorites. A long one, but worth it.

When the world first came to fruition all of the animals saw that they had a certain amount of years to live, and each had a certain thing to do for those years.
The rabbit first saw that he had 40 years to run jump and play without a care in the world. But, the rabbit thought that forty was too long so he shaved off twenty and left them on the ground. Then, the beaver noticed that he had twenty years to work hard to create a life and home for himself. But, the beaver thought this was too long so he too took half and left ten years on the ground. Next came the cat. The cat realized that he had fifty years to live to work hard and slave for his family. But, the cat thought he couldn't possibly keep up that work for fifty years, so he dumped thirty years and took twenty instead. Lastly the dog wandered over. The dog saw that he had gained twenty years to sit and bark at everything that passed him. But, dog thought he could not continue that for forty years so he dropped ten.
Now came along the sad human. The sad human was sad because he had been granted only one year to cry poop and eat. But he walked into a field and saw that all the other animals had left behind some years. The human jumped at the chance and picked them all up. From then on the humans spent the the first year of their life crying pooping and eating. For the next twenty he would be free and play. After that he would struggle to make a list feel for himself for ten years. Later he would slave thirty years for his family, and finally he would sit on his porch for ten years barking at everything that went by.
EDIT: Misspellings and grammar