'Iron Man 3' rules world, 'Pain & Gain' takes top box office spot in US

Sunday studio estimates show director Michael Bay's true-crime tale "Pain & Gain" muscled into first-place domestically with a $20 million debut. The movie starring Mark Wahlberg, Dwayne Johnson and Anthony Mackie knocked off Tom Cruise's sci-fiMichael Bay's action comedy Pain & Gain flexed its box office muscles on Friday, earning $7.5 million on its first day in theaters. Paramount's $26 million R-rated film, which stars Mark Wahlberg and Dwayne "The Rock"Michael Bay's action/comedy/drama about bodybuilding criminals, "Pain & Gain," is flexing its way into theaters this Friday, as is the rom-com "The Big Wedding." "Big Wedding" is bursting with A-listers, like Robert De Niro, Diane Keaton, and AmandaReceipts for "Pain & Gain" beat pre-weekend forecasts for a debut of at least $15

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