''Mama'' tops weekend box office

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Oh "Mama"!

Jessica Chastain dominates the weekend box office. Chastain has the top two movies this weekend. Her supernatural horror film "Mama" opens at number one with more than $28 million.

"Zero Dark Thirty" falls to second, with $17.6 million. "Silver Linings Playbook" is third. Arnold Schwarzenegger's return to top-billing is off to a weak start. Schwarzenegger's new film "The Last Stand" barely cracks the weekend top 10.  It brings a little over 6 million  -- one of his worst openings ever.