There Are 5,000 Janitors in the U.S. with PhDs
There are 18,000 parking lot attendants in the U.S. with college degrees. There are 5,000 janitors in the U.S. with PhDs. In all, some 17 million college-educated Americans have jobs that don't require their level of education.
http://gizmodo.com/5671062/there-are-5000-janitors-in-the-us-with-phds