Let us think about the task of producing a working watch for a moment.
Our first step would require planning, design and blueprints. Only then could we design and create the machines to forge and produce each individual part needed to assemble a watch. All of the miniature springs, gears and movements will have to be designed and built to extreme tolerances. Now supposing we take all these brand new parts and throw them out into a field. How many millions of years of evolution would go by before they accidentally assemble themselves into a functional watch?
Source: East County Californian