David Letterman Walks Out on Joan Rivers [Video]

Last week it was Joan Rivers who walked out on a CNN interview, so when Joan appeared on The Late Show with David Letterman, Dave returned the favor.

By the way, isn't this the same Joan Rivers who was an eager celebrity apprentice a few years ago on Donald Trump's ego-driven reality show? Maybe it's time for Joan to return to the boardroom and have The Donald make a final decision.