Late Night Highlights: Jay Goes Undercover and Jon Stewart Attacks Fox News

Twitter is literally ruining late night. Case in point: last night's Late Show with David Letterman, where guest Demi Moore used her first segment to explain Twitter (before reading a text message aloud from her husband). For her second segment, the Joneses star staged a Twit pic with the host. Forget the fact that Moore pulled the same schtick over at the Tonight Show last week. This social networking phenomenon is breeding a late night trend that must be stopped. The proof, as well as the actually entertaining highlights you missed last night while taking your last holiday hit, after the jump.

5. Undercover Jay

Seven words for you: Jay Leno with an Eastern European accent.

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