Scott McNealy will resign as CEO of Sun Microsystems, according to a Forbes story reportedly in the works. But when a journalist (and tipster) called Sun, they'd heard no such thing.
The story might have started at the more risk-taking MarketWatch, which spun an analyst report ("given this, this, and that, McNealy's work might be done here") into a prediction ("oh, he's so out"). Now a pundit-driven rumor will be presented as fact, sparking a media rush on the story and eventually convincing the actual subjects to hold on for a while. And you know we just hate that sort of thing.