Who's on first? Fallon. And Crystal. And Seinfeld.

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Who's on first? Fallon. And Crystal. And Seinfeld.

Want to see how you update a timeless classic?

Watch Jimmy Fallon join forces with two of his friends -- Billy Crystal and Jerry Seinfeld -- to bring a new twist, and new laughs, to Abbott and Costello's "Who's On First?" routine: