On tonight's 30 Rock, a fake rumor that Liz was pregnant started circulating. (In reality, though, she was just covering for Avery, who needed to secure a promotion.) How'd everyone find out? Why, from Nightly News' Brian Williams, of course!

[There was a video here]

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Brian Williams Makes Another Amazing 30 Rock Cameo

Update: Another moment, from the end of the episode!

[There was a video here]

[30 Rock]