Shia LaBeouf's Disturbia, a low-budget version of Alfred Hitchcock's Rear Window with a decidely younger appeal, opened at No. 1 with three-day ticket sales of $23 million, distributor Paramount Pictures said Sunday. The Will Ferrell comedy "Blades of Glory" slipped to No. 2 with $14.1 million over the weekend , while the Halle Berry and Bruce Willis thriller "Perfect Stranger" landed at No. 4 with $11.5 million and Pathfinder landed at No. 6 with $4.8 million.