Despite some critics' reservations, Elysium soared to the top of this weekend's box office, opening with $30.5 million. But as the Los Angeles Times reports, the weekend's surprise was Jennifer Aniston/Jason Sudeikis comedy We're the Millers, which unexpectedly grabbed the No. 2 slot with $26.6 million; 3D animated flick Planes, which had been expected to take second, instead settled for third with $22.5 million. Grabbing the No. 4 was Percy Jackson: Sea of Monsters, with $14.6 million.