America's love affair with schlocky teen films continues: The horror flick Darkness Falls debuted atop the box office over the weekend with $12.5 million. Last weekend's No. 1 movie, Kangaroo Jack, fell to second place with $11.9 million. Golden Globe winner Chicago, meanwhile, expanded to more theaters and climbed to No. 3 with $8.5 million. Rounding out the top five: Just Married (No. 4 with $7.5 million) and National Security (No. 5 with $7.4 million).