剧情介绍
光仔(薛立贤饰)的母亲自杀了，因此他也整天闷闷不乐，再也不喜欢呆在家里，希望能快快长大，并千方百计地“离家出走”以此向爸爸要钱。最难过的事情就是自从妈妈去世以后，光仔再也没有长高，而他一直把这件事情归咎于爸爸(黄日华饰)与新妈妈(莫文蔚饰)的错，整天与父母对着干。光仔这个要长大的想法一直在脑海中徘徊，直到有一天，他在公园里遇上了一个捡破烂的老头(冯小刚饰)，他有一种可以快速成长的药水，可以使得他在一夜间变成一个二十多岁的年轻人，光仔便设计偷了过来。“长大后”的光仔(刘德华饰)终于实现了梦寐以求的理想。然而这并不是真正的长大，因此他仅仅是个大小孩而已。而且药水的作用会使他一直不停的猛长，每天变老10岁，因此在短短一个星期内就成了83岁的老爷爷。刚开始的时候光仔还决心追求他的梦中情人暨老师MissLee(应采儿饰)，而当他的生长速度变得超快以后，他放弃了，这时他才得知不能去寻找解药了。不过他却明白了自己在家人心中是多么重要，便于与家人和好了。光仔的爸爸是学校篮球队的教
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