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Hong Kong superstar comedian Stephen Chiau stars in this wild and woolly yarn directed by Jing Wong. Jing Koo (Chiau) is the master of the practical joke and demands hefty fees to ply his trade on unsuspecting victims. Jing's latest client is the shady Macky Kam (Waise Lee Chi-hung) who wants Jing to trick his co-worker, Chi Man-kit (Andy Lau Tak-wah), into believing that the trickster is the guy's long lost brother. Macky's aim in this joke is to break up Man-kit's relationship with his comely girlfriend, Lucy (Rosamund Kwan Chi-lam), hoping that he can have her for himself. The trick proves to be wildly successful; not only does Lucy dump Man-kit, but the guy and his father lose their jobs. Jing feels terrible about the whole thing and resolves to rectify the situation. Unfortunately, Jing also has to contend with a new rival jokester who goes by the moniker "the Ultimate Expert."