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http://youtu.be/v14SicRE38o - In four separate instances, in a September 18, 2008 with Elko, Nevada's NBC affiliate, Barack Obama was distracted by a fly and broke into laughter. After the last time, he ended the interview.
http://youtu.be/QYdSzAo1do4 - In June 2009, the newly-elected president killed a fly that interrupted an interview.
http://youtu.be/QmJ0Eei8kcU - And during a 2010 announcement on healthcare reform, Mr Obama cut off an emotional story about an American struggling without health insurance as a fly zipped around him.