Why, oh why? I’ll never understand… Horror fans remained on the line for When a Stranger Calls (review #1, #2), a remake of the scary movie about a terrorized baby sitter that debuted at No. 1 with an estimated $22 million over the typically sluggish Super Bowl weekend. Distributor Sony, whose Screen Gems banner released “When a Stranger Calls,” said it was the best Super Bowl debut ever, beating the $19 million haul the studio’s horror flick “Boogeyman” took in over the same weekend last year. 20th Century Fox’s Big Momma’s House 2 slipped to second place with about $13.35 million, lifting its 10-day total to $45.4 million, according to studio estimates Sunday. The weekend’s other new wide release, Focus Features’ romantic comedy Something New (review), opened at No. 7 with roughly $5 million. With fans staying home Sunday for the big game, theaters were quiet, though key Academy Awards contenders including Focus Features’ best-picture front-runner Brokeback Mountain (review) benefited from last week’s nominations.