Never underestimate the lethal power of a teenage girl. By moving into the weekend’s No. 2 spot with $12.4 million, Focus Features’ “Hanna” proved the unpredictability of B.O. estimates.

Going into the weekend, “Hanna” was the biggest question mark for B.O. observers, who were uncertain whether it would attract enough of its core male demo. Pic skewed mostly to younger auds, the same as “Arthur.”

The other two pics in the top three underperformed on Sunday estimates.

And while Universal’s “Hop” won the weekend handily, grossing $21.3 million in its second weekend, it was off from U’s estimate of $21.7 million.

Warner Bros.’ “Arthur” came in third, with $12.2 million, according to Warners’ weekend actuals, down considerably from the studio’s estimated $12.6 million.

“Hanna” outgrossed “Arthur” on Sunday, with the former dropping just 37% from Saturday — the market’s best Saturday-Sunday drop. “Hanna’s” improved weekend gross marks an even better start for the film, as it looks to broaden its demo base over the coming weeks.

“We were all intersecting for the most part the same demo,” said Focus distrib topper Jack Foley.

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