Old Mr. Lo has three sons and the youngest one Lo Kung is his favorite. However, Kung does nothing but fool around all day long. Old Mr. Lo is very annoyed about this. The relationship between father and son is thus affected. So on Kung's birthday, his two brothers decide to play a joke on him. They trick him into believing he has won the lottery. Kung is so happy that he spends a tremendous amount of money. When he realizes he is in huge debt, he pretends to go insane and the whole family believes him.
Roy Chiao
as Mr. Lo
黃百鳴
as Lo Leung
吳鎮宇
as Lo Fei
周星馳
as Lo Kung
伍詠薇
as Yinsu
吳倩蓮
as Shenny
李蕙敏
as Monalisa Kam
鍾麗緹
as Little Suen
黎姿
as Gigi
楊玉梅
as Tequila
周華健
as Long
雷宇揚
as Brother Smartie
