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"Paranormal Activity" and "Where the Wild Things Are" swapped spots in the movie box office rankings this weekend, Box Office Mojo said.

"Paranormal Activity" took over at No. 1 by pulling in an estimated $22 million in ticket sales, while "Wild Things" slipped from the top spot to No. 3 with $14.42 million.

The horror show "Saw VI," directed by Kevin Greutert, opened at No. 2 with $14.8 million in gross gate receipts.

"Law Abiding Citizen" slid from second to No. 4 at $12.71 million and "Couples Retreat" was down one spot to No. 5 with $11.1 million in estimated ticket sales.

"Astro Boy," an animated movie with Freddie Highmore providing the voice for the title character, debuted at No. 6 with $7.02 million, while "The Stepfather (2009)" moved down from fifth to No. 7 at $6.5 million.

"Cirque du Freak: The Vampire's Assistant," a blood-sucker flick from Paul Weitz, opened at No. 8 with $6.35 million.

Rounding out the Top 10 were "Cloudy with a Chance of Meatballs" at $5.6 million and "Zombieland" at $4.3 million.

Dropping out of the Top 10 were "Toy Story/Toy Story 2 (3D)," "The Invention of Lying" and "Surrogates."

"Amelia," starring Hilary Swank as the famed aviatrix Amelia Earhart, opened just out of the top tier with $4.23 million.

The Coen brothers' "A Serious Man" continues its stealthy climb, moving up to the 12 from 15th place, grossing $1.13 million in its fourth week despite showing in just 176 theaters.