Paramount's Paranormal Activity 2 scared up an astounding $41.5 million at the box office over the weekend, according to the studio's estimates, far exceeding analysts' predictions and setting a weekend record for a horror film. The previous record was held by last year's relaunch of the Friday the 13th franchise, which earned $40.5 million. That movie went on to earn $65 million domestically. Coming in second was Paramount's Jackass 3D , which, as expected, dropped nearly 60 percent to wind up with an estimated $21.6 million. Slipping into third place was Summit Entertainment's RED, which dropped just 30 percent in its third weekend with $15 million. Moving into wide release after opening in six theaters last week, Clint Eastwood's Hereafter came in fourth with about $12 million.

The top ten films for the weekend, according to studio estimates compiled by Box Office Mojo 1. Paranormal Activity 2 , $41.5 million; 2. Jackass 3D , $21.6 million; 3. RED , $15 million; 4. Hereafter , $12 million; 5. The Social Network , $7.3 million; 6. Secretariat , $6.9 million; 7. Life as We Know It , $6.2 million; 8. Legend of the Guardians The Owls of Ga'Hoole , $3.2 million; 9. The Town , $2.7 million; 10. Easy A , $1.8 million.