1991年《整蠱專家》中星爺飾演整蠱專家古晶，他受了金默基（李子雄飾）的委託離間假扮成小職員的富家女程樂兒（關之琳飾）和她喜歡的車文杰（劉德華飾）之間的關係，為了接近文杰一人分飾多角，假冒成車親仁（吳孟達飾）的私生子混入車家，過程中反而讓樂兒的朋友Banana（邱淑貞飾）對他有好感。在多次整人計劃中，古晶對自己的行為感到愧疚，決定再也不整車氏父子，同時阿杰得知樂兒的真實身分和她與金默基之婚約，最後他與古晶聯手反擊，金默基卻找上「整蠱之霸」（程東飾）……
The superstar comedy stylings of Stephen Chow get a mega-workout in Tricky Brains, an early blockbuster hit starring Stephen Chow and Andy Lau! Stephen Chow is Jing Koo, the self-styled "Handsome Tricky Expert", who will gladly screw with you if it means a paycheck for himself. The payee is Macky (Waise Lee), who wants the handsome Kit (Andy Lau) out of the way so he can be made manager of the company. Jing Koo takes the job, and starts his con by fooling Kit's father (frequent Stephen Chow collaborator Richard Ng Man Tat) into thinking that he is, in fact, the long-lost half brother of Kit. Both Kit and his dad buy into Jing Koo's tricks, but their kindness is rough on the avowed trickster. Will he regret tricking Kit and his father? And will the office be reduced to a shambles once the "Handsome Tricky Expert" is done with them?
Tricky Brains demonstrates Stephen Chow's snarky comic persona at its absolute best, meaning the master comedian spends all his time imposing his superiority over the less quick-witted folks around him. Jing Koo runs virtual rings around all his victims, which include sexy Chingmy Yau, and Rosamund Kwan as Kit's nominal love interest. Like other films directed by Wong Jing, Tricky Brains is a wacky joke-a-minute laffer full of movie parodies, sudden musical numbers, and enough silliness to fill ten other films. And like other Stephen Chow movies, Tricky Brains is one incredibly funny movie!