Acid-tongued comedienne Joan Rivers recently stirred up a little bit of trouble when she walked out of an on-air interview after taking issue with the supposedly "negative" host (who was asking Rivers - who makes her bread and butter by making fun of people - about the negativity in her act and her latest book). Rivers clearly loves the attention provided by such a stunt, but that doesn't mean she's into the idea of the same thing happening to her.

Rivers hit 'The Late Show' last night, and host David Letterman decided to wait for the right opportunity to give the funny lady a taste of her own medicine -- in a big, pretty unexpected way. Even the self-possessed Rivers was stunned by the turn of events, though that didn't keep her from continuing with some foul-mouthed jokes -- well, eventually.

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