G.J. Echternkamp tells the story of his relationship with his parents, his mother Cindy (Russo) and his step-father, Frank (Platt). Frank used to be a member of OXO, a band from the '80s whose one hit wonder scored with the song "Whirly Girl". Cindy was the ultimate groupie who married Frank and thought life would be glamorous and award shows, but it's not how it turned out.

　　民國時(shí)期，世道紛擾，兵荒馬亂，各種各樣稀奇古怪的事情層出不窮：
　　商會(huì)會(huì)長任洛天（許冠文 飾）年過半百，色心不減，為求與妓女小紅春宵纏綿而高價(jià)求購印度春藥，不想樂極生悲，做了花下風(fēng)流鬼；警察局督察長（許冠文 飾）橫征暴斂，貪得無厭，不僅將醫(yī)院做成買賣鋪，還盤剝妓女間老弱病殘，東窗事發(fā)后腳底抹油，溜之大吉；年過古稀的老太太傅于氏（許冠文 飾）胃口不適，偏偏戒不了口腹之欲，無奈何最終上了手術(shù)臺(tái)，更遭遇馬虎大夫，只得連番開膛破肚，叫苦不迭；理發(fā)館一樂也的小伙計(jì)小六（許冠文 飾）愚鈍可愛，時(shí)而惹得師娘（胡錦 飾）暴跳如雷，時(shí)而令師傅哭笑不得，由此上演無數(shù)搞笑且驚悚的市井鬧劇……