Six Feet, and No Water
So, like any hard working farmer would, he starts digging a hole and spends all day digging down into his land, eventually getting down six feet. To his disappointment, he finds no water.
The next day he goes out and finds a new spot to dig 100 feet away from his first hole and spends all day digging, getting down six feet, but still finds no water.
So each day for two solid weeks he keeps moving to a new hole 100 feet away from the last hole until his farm is covered in six foot holes, none of which produce water for a well.
The farmer, having worked so hard for so long, is confident there is no water under his land and gives up the search.

