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This image provided by NBC shows Jimmy Fallon, left, and first lady Michelle Obama dancing on the set of Late Night with Jimmy Fallon, Friday Feb. 22, 2013 in New York. The dance was part of Obama's “Let’s Move” campaign. (AP Photo/NBC, Lloyd Bishop)

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This photo released by NBC shows, Johnny Sequoyah as Bo, in the pilot of the new NBC television series, "Believe." Alfonso Cuaron and J.J. Abrams ("Lost," the "Star Trek" movies) are executive producers of "Believe," a drama about a child whose supernatural powers put her and the world at risk. (AP Photo/NBC, Eric Liebowitz)

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This photo released by NBC shows Sienna Guillory, left, as Moore, and Johnny Sequoyah as Bo, in the pilot of the new NBC television series, "Believe." Alfonso Cuaron and J.J. Abrams ("Lost," the "Star Trek" movies) are executive producers of "Believe," a drama about a child whose supernatural powers put her and the world at risk. (AP Photo/NBC, Eric Liebowitz)

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This Feb. 24, 2014 photo released by NBC shows, from left, Carson Daly, Natalie Morales, Savannah Guthrie, Matt Lauer, Al Roker, and Ronan Farrow on "Today," in New York. After winning in the ratings for two weeks during the Winter Olympics _ NBC's first weekly wins since the London games in summer 2012 _ the "Today" show has kept some of its momentum now that Matt Lauer, Savannah Guthrie and the team are back in the New York studio. (AP Photo/NBC, Peter Kramer)

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This photo provided by NBC shows Benjamin Stockham as Marcus in an episode of NBC's new sitcom, "About A Boy." The television series airs Tuesday nights on NBC. (AP Photo/NBC, Jordin Althaus)

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This photo provided by NBC shows Benjamin Stockham, left, as Marcus and David Walton, as Will Freeman, in an episode of NBC's new sitcom, "About A Boy." The television series airs Tuesday nights on NBC. (AP Photo/NBC, Jordin Althaus)

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Bob Costas appears with pink eye during the Olympics in this NBC screen grab.

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FILE - This Tuesday, Feb. 18, 2014, file photo, released by NBC shows host Jimmy Fallon during "The Tonight Show Starring Jimmy Fallon," in New York. Scores of people dressed in parkas and polar bear outfits gathered along Chicago's lakefront Sunday, March 2, 2014, hoping to catch a glimpse of comedian Fallon when he jumps into Lake Michigan. "The Tonight Show" host agreed to make Sunday morning's so-called "Polar Plunge" with Mayor Rahm Emanuel as a condition for the mayor appearing on Fallon's show in New York, following an exchange of tweets and challenges. (AP Photo/NBC, Lloyd Bishop, File)