Michael Hui Koon-man (born Chinese: 許冠文; 3 September 1942) (also known as Mr Boo!) is a Hong Kong actor, comedian, scriptwriter and director. He is the eldest of the four Hui brothers (together with Ricky, Sam, and Stanley) who were prominent figures in the Hong Kong entertainment industry during the 1970s and the 1980s. Michael Hui is considered by many critics to be one of the foremost comedians in the Hong Kong film industry.