Just Another Pandora's Box, also known as Once Upon a Chinese Classic, is a 2010 Hong Kong parody film directed by Jeffrey Lau, starring Ronald Cheng, Gigi Leung, Betty Sun, Eric Tsang, Huang Bo, Guo Degang, Gillian Chung, and Patrick Tam. It is a spiritual successor to Lau's two-part 1995 film A Chinese Odyssey. Athena Chu, who starred in A Chinese Odyssey, makes a guest appearance in Just Another Pandora's Box.

The film's Chinese title is a pun on the Chinese title of the first part of A Chinese Odyssey, Yuè Guāng Bǎo Hé (月光寶盒). The last three characters of each title are the same, only the first differs; the pronunciations of 月 and 越 are the same in both Cantonese (jyut6) and Mandarin (yuè). The older title translates literally to "Moonlight Treasure Box"; in the title of this film, the character for "moon" is replaced by 越, in this context meaning "more" or "surpassing".

In addition to A Chinese Odyssey, the film spoofs Red Cliff and also makes references to other films such as The Eagle Shooting Heroes, Kung Fu Hustle, House of Flying Daggers, CJ7, Kung Fu Panda, Titanic, King Kong, The Green Hornet, and The Matrix, as well as events such as the 2008 Summer Olympics.