Things get freaky when Steve Martin, Martin Short, Selena Gomez and Jimmy accidentally swap voices after their pre-show handshake.

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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.

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Steve Martin, Martin Short, Selena Gomez and Jimmy Swap Voices Freaky Friday Style (Cold Open)
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