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, Yueguang Baohe (). 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 (jyut) 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.
Rose Fairy is sailing along the river when she suddenly trips on a rope and falls into the water. The trap is set by the bandit Qingyise, who wants to rob her. He steals the Purple Sword from her and plans to sell it. Just then, Joker (the protagonist in A Chinese Odyssey) appears and makes Qingyise unsheathe the sword by pulling away its scabbard. Rose Fairy regains consciousness and mistakenly thinks it was Qingyise who unsheathed the sword. Since she has made a promise to marry the person who unsheathes the sword, she follows Qingyise wherever he goes, leading to a cat-and-mouse chase between the two of them.