The domestic box office remained sluggish over the weekend, with the top film, Pain and Gain, pulling in $20 million -- at the low end of most analysts' predictions -- while the Tom Cruise sci-fi thriller Oblivion dropped by a little more than half in its second week to $17.4 million. Moviegoers left the comedy The Big Wedding standing at the altar with just $7.5 million -- an amount that wouldn't even have come close to covering the pay of its all-star cast, which included Robert De Niro, Katherine Heigl, Diane Keaton, Amanda Seyfried, Topher Grace, Ben Barnes, Susan Sarandon and Robin Williams. But while the domestic box office remained listless, the overseas box office exploded as Iron Man 3 debuted with $195 million. It was the fourth-biggest opening ever, behind Harry Potter and the Half-Blood Prince ($302 million); Pirates Of The Caribbean: On Stranger Tides ($260.4 million); and Pirates of the Caribbean: At World's End ($216 million) It was $10 million more than what last year's The Avengers, the biggest hit of 2012, earned in its debut. With a population that is only 20 percent the size of the U.S.'s, the U.K. alone contributed $21 million to Iron Man 3's gross -- more than what Pain and Gain, the No. 1 film domestically, earned in the U.S. and Canada.

The top ten films for the weekend, according to studio estimates compiled by Box Office Mojo:
1. Pain and Gain, $20 million; 2. Oblivion, $17.4 million; 3. 42, $10.7 million; 4. The Big Wedding, $7.5 million; 5. The Croods, $6.6 million; 6. G.I. Joe: Retaliation, $3.6 million; 7. Scary Movie 5, $3.5 million; 8. Olympus Has Fallen, $2.8 million; 9. The Place Beyond the Pines, $2.7 million; 10. Jurassic Park in 3D, $2.3 million.