Why would someone build a bridge to nowhere? Either they do not realize where they were headed, or they just are not the sharpest tool in the shed. The fact is though, all of us have constructed our own bridges to nowhere—in other words, spending a lot of effort on something that will never take us to a useful destination. Chances are, most of us have, at one time or another, held onto grudges—which are effectively bridges to nowhere.

Full text at http://www.tomorrowsworld.org/commentary/a-bridge-to-nowhere