<b>2015 Lie of the Year: the campaign misstatements of Donald Trump</b>

 "I watched when the World Trade Center came tumbling down," he said at a Nov. 21 rally in Birmingham, Ala. "And I watched in Jersey City, N.J., where thousands and thousands of people were cheering as that building was coming down. Thousands of people were cheering." Pants on Fire. 

http://www.politifact.com/truth-o-meter/article/2015/dec/21/2015-lie-year-donald-trump-campaign-misstatements/