How convenient.

At first the man was happy. He ate, slept and
occasionaly indulged in copulation.

Till he realized life was very inconvenient having to walk all the way everytime an ice age occurs.
Also, the coldness of ice wasn't helping either.

So one day the man suddenly created the wheel.
Then he accidently created fire.

Then he figured he was taking too much time travelling between his hunting ground and his home-cave, so he created a cart using the wheels to make his life more convenient.

Then he figured he needed something to push it, so he decided to yoke horses to his cart.

Once he could save some time travelling, his wife decided to put the spare time to better use by shopping.

Gradually, the list of items to shop grew longer and soon there were more things to shop and less time.

So he built an engine to replace his horses.

The engine required fuel. So he created mines to mine the fuel.

Soon other men decided they too wanted one of these fast moving things so they asked our man to make some more.

So the man now set up factories to produce more vehicles.

As the demand grew, the man decided to make things more
convenient by building machines that would build carts.

Someone else in the meantime decided to build his own
cart.

Soon there were a lot of carts and no fuel.

So the man decided to dig deeper in the ground for the fuel.

When he could find none, he decided to find it elsewhere.

Soon there were a lot of men digging deep elsewhere.

Gradually, no more elsewheres could be found.

In the meantime, the man realized that his cart ride was very bumpy.

So to make his ride more comfortable, he decided to build roads.

But the roads would be spoiled by rains.

So he decided to use up some of his fuel to build tar roads.

Now that the roads were better, other men wanted to travel farther and wider.

So more roads needed to be built.

Soon, a lot of fuel was being burnt so that more fuel could be burnt.

And then again, there wasn't much fuel remaining.

So man decided to snatch someone else's fuel.

This led to physical combats.

To gain advantage, man built weapons.

Other men built better weapons.

Soon men were creating more weapons than men.

So more machines were required to build more weapons.

More weapons meant more machines that meant more fuel that meant more weapons that meant more machines.. and er.. one gets the point.

And now, man is happy how convenient his life has become.