Based on the novel by Karel Capek, the prominent Czech writer of the early 20th century who coined the word robot for his play R.U.R., the story revolves around a discovery of Krakatit - a powerful explosive - by Prokop, an experimental scientist who, following an accidental explosion in his lab, slips in and out of delirium. When he realises that, in a delirious period, he has given the formula for making Krakatit to one of his colleagues, he tries to find the man, who does not realize how dangerous a thing Krakatit is. In the process, he nearly gives his discovery away again to foreign interests, a group of anarchists, and even greater forces of darkness...
暌违四年，疯狂恶作剧的爱好者们再度回归，继续诠释自毁式恶作剧的精髓。本纪录片倾情奉献来自恶作剧先进国家的成功经验。连环计：先向车里灌入蜂群再用滑珠迎接逃出来的车中人；顺手牵羊计：帮助公马自慰，得到的液体不好浪费，喝掉了事；偷梁换柱计：把鱼钩从脸上穿过，用人当鱼饵钓鲨鱼；假痴不癫计：化装成老年人各种戏弄无辜路人；打草惊蛇计：把蟒蛇藏在海洋球中与之肉搏；美人计：在粉丝情书后面安装了机关拳头来一个打一个；声东击西计：扑克牌结合电椅，令受害人完全不知痛感因何而来；最终大计瞒天过海：假恐怖分子遭遇假出租车司机，整人反被整……当然我们的恶作剧英雄们依然彪悍，血肉之躯对抗公牛、玻璃、铁夹、防暴武器、水蛭、铁耙，看的连你也肉疼！
影片故事发生在“莱咖国”政权交替之际，黑势力头目宋邦（曾志伟 饰）欲洗白，勾结官员行贿，但遇到了巨额资金缺口。得力干将郑咤（安志杰 饰）与身份成谜的打手苏万（汪东城 饰）杀人越货、横行作恶，一步步帮“老板”上位。就在宋邦以为坐收渔翁之利时，三人的关系发生了惊人反转。
