Oprah's Next Chapter:
Why David Letterman Apologized to Justin Bieber, Sarah Palin and Others
Three decades ago, David Letterman turned late-night television upside down. At first, no one knew what to make of his hilariously awkward—and at times intimidating—celebrity interviews. Does it bother Dave when he hurts a guest's feelings? Find out now. Plus, Dave reveals why he apologized to Justin Bieber, Paris Hilton, Sarah Palin and Donald Trump.