We already knew that David Cheriton, the Stanford professor who introduced Larry Page and Sergey Brin to the venture capitalists at Kleiner Perkins and who subsequently became a billionaire, was cheap. But we didn't fully realize the depths of his frugality. A Forbes piece on penny-pinching billionaires reveals that Cheriton not only refuses to pay for a Stanford parking permit, but he also reuses teabags. Gross. Furthermore, he still cuts his own hair. Doesn't Cheriton realize that Larry and Sergey will gladly provide their former college professor a free trim? (Photo courtesy of David Cheriton via Forbes)