Box office revenues were down this weekend, with the top movie, Baby Mama, grossing only $18.3 million (all figures US). Harold & Kumar Escape from Guantanamo Bay debuted in second place, earning $14.7 million. Last weekend’s top movie, The Forbidden Kingdom starring Jackie Chan and Jet Li, dropped to third with $11.2 million in its second weekend out. Forgetting Sarah Marshall fell to fourth from second, taking in an additional $11 million. The family movie Nim’s Island held onto fifth place, rounding out the top five with $4.5 million.