"It's hard to hear at first, but yes, at 1:29 into this video, the president of the United States is indeed heckled while addressing Congress. The outburst comes from Rep. Joe Wilson of South Carolina, who shouts, "You lie!" as Obama argues that his health-care plan would not cover illegal immigrants."

via http://www.thedailybeast.com/blogs-and-stories/2009-09-10/top-five-moments-from-obamas-address/