I don't know why experienced TV journalists never learn this lesson. But the current online climate makes it plain: famous anchors lose their tempers on set at their own peril.

Industry veterans know that production staffers, who often earn many times less the salaries of the highly-paid, high-strung primadonnas losing it publicly, love to secretly roll tape when a famous face is having a tantrum. Rest assured that the embarrassing video will surface later, plunked online by someone who got a bootleg tape from a friend of a friend and can't wait to share it with cyberspace.

Here is Bill O'Reilly blowing his top when he was an anchor on Inside Edition, apparently upset that someone didn't write a tagline capping the end of the show, just before proving that he didn't really need the script, anyway.

Here's the F-word heard around cyberspace -- New York anchor Sue Simmons loosing the F-word at the end of a promo she thought was being taped, but was actually airing live.