LIFE

On the first day God created the dog. God said, "Sit
all day by  the door of your house and bark at anyone 
who comes in or walks past. I will give you a life span 
of twenty years."
The dog said,  "That's too long to be barking. Give me
ten years and I'll give you  back the other ten." So God agreed. 

On the second day God created the  monkey. God said, "Entertain people, do
monkey tricks, make them laugh. I'll  give you a twenty-year life span." The
monkey said, "How boring.  Monkey tricks for twenty years? I don't think so.
Dog gave you back ten, so 
that's what I'll do too, okay?" And God  agreed.

On the third day God created the cow. God said,  "You
must go to the field with the farmer all day long and suffer under  the sun,
have calves and give milk to support the farmer. 
I will give  you a life span of sixty years."
The cow said, "That's kind of a  tough life you want
me to live for sixty years. Let me have twenty and I'll  give back the other
forty." And God agreed again. 

On the fourth day God created man. God said, "Eat, sleep, play, marry and
enjoy your life.  I'll give you twenty years." Man said, "What? Only twenty
years?! Tell you what, I'll take my twenty, and the forty the cow gave back
and the ten the monkey gave back and the ten the dog gave back...that  makes
eighty, okay?" "Okay", said God, "You've got a  deal." 

So that is why the first twenty years we eat, sleep, play, and  enjoy
ourselves; for the next forty years we slave in the sun to support our
family; for the next ten years we do monkey tricks to entertain the
grandchildren; and for the last ten years we sit on the front porch and bark
at everyone.

Life has now been explained to  you.