To the surprise of almost no one, "Prom Night" was the weekend winner with $22.7 million. It's the latest proof that, with torture porn having run its course with audiences, studios have found a new formula for box-office success.

They're toning down the blood and violence to earn a PG-13 rating. Combine that with a short running time ("Prom Night" is just 88 minutes long) and an attractive cast of nobodies, and it's almost guaranteed to lure big crowds of teenagers to the multiplex on opening weekend. "Shutter" recently scored decent money the same way. The unfortunate part of the equation is that these films are NEVER screened for critics, which is why you're only seeing the trailer for "Prom Night" instead of Jeffrey & Alison's review here.

Get the rest of the box office results after the jump.

In second place was the crime drama "Street Kings" with $12M. Despite a stellar cast with Keanu Reeves, Forest Whitaker and Hugh Laurie, it looks like movie fans are finally tired of the 'dirty cop' genre. Maybe it's time someone made a movie about a cool cop who's not corrupt??

The sturdy "21" banked another $11M for third place, and appears heading for an $80-90M total. Good for Jim Sturgess, one of Hollywood's future superstars IMHO.

"Nim's Island" was fourth with $9M in its sophomore weekend while George Clooney's gridiron comedy "Leatherheads" finished fifth with a lackluster $6.2M.

Meanwhile, two films that Jeffrey & Alison raved about did gangbuster numbers in limited release. "The Visitor" earned a superb $22,000 in each of its four screens, while "Young @ Heart" took in $13,075 in its four theaters. Let's see how they do when they expand nationally in the next few weeks.