A warning to the easily startled: Tuesday night's episode of The Tonight Show may keep you awake. Sure, Jimmy Fallon had Tina Fey and Allison Williams on, both of whom are charming, and they made effortless jokes about their lives, as well as Fallon's new status in the hierarchy of late night hosts. But, just when the humor seemed to reach a comfortable lull, Fallon whipped out "Lip Flip," a new Tonight Show segment where he digitally swaps mouths with his celebrity guest. The results are absolutely terrifying. --Celeste Mora
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