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Guinness Book of World Records holder John Cassidy performs a balloon act for U.S. First Lady Michelle Obama in the Diplomatic Reception Room of the White House, in this official White House handout photo taken October 11, 2011 and acquired by Reuters from the White House on November 7, 2011. Cassidy performed for kids on the South Lawn of the White House before the First Lady launched a challenge to break the Guinness World Records title for the most people doing jumping jacks in a 24-hour period. (REUTERS/Chuck Kennedy)