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Published on Dec 20, 2012
Fallon, Crystal, and Seinfeld revisit Abbott & Costello's classic "Who's On First?" routine, where we finally get to meet the team's first-baseman "Who," second-baseman "What," and third-baseman "I Don't Know."
The Tonight Show Starring Jimmy Fallon features hilarious highlights from the show including: comedy sketches, music parodies, celebrity interviews, ridiculous games, and, of course, Jimmy's Thank You Notes and hashtags! You'll also find behind the scenes videos and other great web exclusives.