Alanis Morissette and Jimmy put on disguises and give a surprise performance of "The Little Drummer Boy" and her hit "You Oughta Know" in a New York City subway station. Subscribe NOW to The Tonight Show Starring Jimmy Fallon: http://bit.ly/1nwT1aN Watch The Tonight Show Starring Jimmy Fallon Weeknights 11:35/10:35c Get more The Tonight Show Starring Jimmy Fallon: https://www.nbc.com/the-tonight-show JIMMY FALLON ON SOCIAL Follow Jimmy: http://Twitter.com/JimmyFallon Like Jimmy: https://Facebook.com/JimmyFallon Follow Jimmy: https://www.instagram.com/jimmyfallon/ THE TONIGHT SHOW ON SOCIAL Follow The Tonight Show: http://Twitter.com/FallonTonight Like The Tonight Show: https://Facebook.com/FallonTonight Follow The Tonight Show: https://www.instagram.com/fallontonight/ Tonight Show Tumblr: http://fallontonight.tumblr.com 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. GET MORE NBC NBC YouTube: http://bit.ly/1dM1qBH Like NBC: http://Facebook.com/NBC Follow NBC: http://Twitter.com/NBC NBC Instagram: http://instagram.com/nbc NBC Tumblr: http://nbctv.tumblr.com/ Alanis Morissette Busks in NYC Subway in Disguise http://www.youtube.com/fallontonight #FallonTonight #AlanisMorissette #JimmyFallon