This is probably as strange for you to read as it was for me to write: The new comedy Kangaroo Jack topped the holiday weekend box office with $21.8 million from Friday-Monday. It edged out Martin Lawrence's new flick National Security, which debuted in second place with $17.5 million. Golden Globe winners Chicago and The Hours, meanwhile, continued to perform solidly in modest release. Chicago ranked No. 6 with $9.1 million, while The Hours climbed 13 places to No. 9 with $5.7 million.