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Warner Bros.' "The Dark Knight" continued to dominate the box office in its second Friday, taking in $23.1 million from 4,366 theaters and propelling its domestic cume toward $300 million.

Repping a 66% decline from its opening day, the current B.O. for the Christopher Nolan-directed superhero pic currently stands at $261.7 million. By Sunday, it's possible that "Dark Knight" might break the record for a pic's second weekend take. Among the highest grossing sophomore frames, DreamWorks' "Shrek 2" holds the title with $72.2 million.

In second place yesterday, Sony's R-rated laffer "Step Brothers" headlining Will Ferrell and John C. Reilly reaped $11.7 million from 3,094 venues.

Universal's "Mamma Mia!" took a 44% dip from its opening a week ago, ringing up $5.5 million off 2,990 for third place. Its eight-day cume currently stands at $50.3 million.

"Dark Knight's" continuing success stole some male action away from Fox's weekend entry "The X-Files: I Want to Believe" which placed fourth yesterday with $4 million from 3,185.

While the long-awaited follow-up to the 1998 pic "X-Files: Fight the Future" performed at the lower end of expectations, the pic had cost under $30 million to produce, thereby minimizing the studio's risk.