Brangelina's rollicking Mr. & Mrs. Smith made a killing at the box office this weekend, raking in $51 million and bumping Madagascar to No. 2 (with $17.1 million). Audiences weren't nearly so quick to warm to the screen's other thrill-seeking duo — kid-flick Sharkboy and Lavagirl debuted in fifth place with a measly $12.5 million. Filling the blanks in the Top Five are Star Wars: Episode III — Revenge of the Sith (third place with $14.9 million) and The Longest Yard (fourth with $13.5 million).