在这部圣诞奇遇结良缘喜剧/犯罪片中,的士司机朱求一，化验员林宝宝和阿Cat巧合地目击龙被杀害，而成为被追杀目标。原来龙把军火专家王Sir的汽水炸弹计划破坏，并偷去炸弹。三人与王Sir斗智斗力，最终将坏人绳之以法。
A crooked Hong Kong cop designs a bomb disguised in a soda can and sells it to two Japanese traffickers; however, the cop's associate steals the bomb, not wishing for it to be used for evil means. He hides the bomb before he is slain by the traffickers. The incident, afterward, brought together three witnesses mixed into the plot: a suave rock scientist, a wisecracking taxi driver and an overzealous biker. They must team up to locate the missing bomb before the dealers find it.
