賣身契（本事）
薛志文（許冠文飾）是「鼠台電視」訓練班學員，曾簽有一紙空白的八年合約；因罕有出鏡機會，屢想跳槽。其弟志英（許冠英飾）爲靑年發明家，已製成遙控笑彈，能令人笑到碌地，不能自主。
志文於偶然機會中，出現「貓台電視」主持「大搏殺」節目，口才伶俐，控制有方，加以志英放出笑彈，更令塲面熱鬧，大得該台經理賞識，欲與簽約，志文因與鼠台已有「賣身契」在先，婉拒所請。
志文回鼠台，與女經理白髮魔女談判解約未果，遂與志英密商，潛入經理室，企圖竊取合同；爲護衞員追逐，志英終被鎖入大夾萬，無法脫身。
朱世傑（許冠傑飾）係靑年魔術家，有妹玲玲（鮑翠玲飾），爲表演時之助手，玲玲與志英已在蜜運時期，志文通過玲玲，求援於朱世傑，希望憑其魔術手法，打開夾萬，救出志英，世傑慨然允之。
三人於禁衞森嚴中，進入鼠台密室，遭受窮追惡趕，受盡驚險，志文誤闖太空艷舞錄映室，混入舞娘群中，載歌載舞，笑料百出，觀衆報以熱烈掌聲，鼠台董事長劇賞志文表演天才，遂罷免白髮魔女職位，堅欲邀志文等人加入鼠台爲副經理，並出以合約囑簽，志文不允動筆，蓋一紙空白，仍然不啻賣身契，一錯不能再錯也。
THE CONTRACT
(A Synopsis)
The contract is a piece of almost blank paper by which MTV binds all its employees to eight years of impecunious service. Chi-Man (Michael Hui), an aspiring but frustrated artist, hates the contract since he is given no chance of getting ahead. He constantly thinks of moving to greener pastures.
His brother Chi-Ying (Ricky Hui) is a self-made investor who has just come up with a laugh bomb.
By chance, Chi-Man pinch hits as compere of a Cat TV program. With the aid of the laughbomb, he becomes an instant success. But he cannot sign up with Cat TV because of the MTV contract.
He is turned down cold when he asks MTV for cancellation of the contract. Therefore, the brothers try to steal it only to have Chi-Ying shut into the safe and Chi-Man chased by the burly guards.
Chi-Man goes to young magician Sai-Kit (Samuel Hui) for help. As Sai-Kit’s sister Ling Ling is Chi-Ying’s girl friends, Sai-Kit promises to open the safe, also clandestinely.
What follows is too hilariously confusing to detail. Any way, Chi-Man unwittingly proves his talent and is invited by MTV to be its manager.
He refuses to sign the contract which again is a piece of almost blank paper.
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