Tropic Thunder kept rumbling this weekend with an $11.5 million box office score and a hold on the top spot, Variety reports. The Vin Diesel vehicle Babylon AD debuted in second with $9.5 million, while third-place Dark Knight made history as the second flick ever to bank $500 million. Filling out the top five were The House Bunny ($8.3 million) and political thriller Traitor ($7.9 million).