Premise: Just Dance (song) . In the United States , `` Just Dance '' was a sleeper hit , spending almost five months on the Billboard Hot 100 before finally reaching the summit of the chart in January 2009 , after being released in April 2008 . The single is among the best-selling singles of all time , having sold over 10 million copies .
Hypothesis: Just Dance was a flop.
Label: CONTRADICTION