Lucky Encounter

Directed by Johnnie To

With Tony Leung Chiu-wai, Kent Cheng Jak-si, Cheng Pak-Lam, Anthony Wong Chau-sang and Sonny Song

Two inventors encounter a friendly little ghost, and stumble onto a plot to capture the ghost's uncle who was responsible for his untimely death. However, the inventors are warned by a spiritual master that humans and ghosts cannot co-exist in the same room at the same time. Doing so would cause a drainage of humans' life force.