'Tropic Thunder' dethrones 'Dark Knight' at box office

• Story Highlights
• "Tropic Thunder" debuted at No. 1, bumping "The Dark Knight" to second place
  
• Batman flick pulled in $16.8 million to raise its total to $471.5 million
  
• "Dark Knight" now No. 2 on the all-time domestic charts, behind only "Titanic"
  
• "Tropic Thunder" was the third R-rated comedy to open solidly in recent weeks
  
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