富顿教授（加里·格兰特 Cary Grant 饰）是一位科学家，正在研究一种能够让人返老还童的神奇药物。某一天，富顿用来试验药物的黑猩猩从笼子里逃了出来，在实验室里“大闹天宫”，没想到竟然在误打误撞之下将富顿一直想要研制但始终没有成功的神药给捣鼓了出来。 对此一无所知的富顿在偶然间喝下了这种药物，很快，药效便发挥了作用，富顿一反常态，言行举止俨然一幅二十岁小伙子的模样。秘书路易斯（玛丽莲·梦露 Marilyn Monroe 饰）前来拜访富顿教授，没想到却被他邀请去游泳、溜冰。之后，富顿的妻子爱德华（金格尔·罗杰斯 Ginger Rogers 饰）亦误食了药物，一连串让人忍俊不禁的趣事就此展开。
Max is a real jerk. A long time ago, the successful lawyer had turned over all the routine duties of family life to his wife Nathalie.His comfort and leisure time were a far greater priority. Sell the roadster and buy an efficient family car? No way!But then, Max’s fast-paced life suddenly screeches to a halt when Nathalie is hospitalized for several weeks with a complicated fracture.Alone with their two children and the dog he hates, Max quickly reaches the boiling point.As if having to play father was not bad enough, he is shocked to the core when he discovers passionate love letters written to his wife and signed “From G. in love”. Feeling that his life is slipping out of control, Max’s first impulse is to find out who his rival is. Then it dawns on him – could the way he has treated his wife be the reason why she has sought out another lover?Now Max attempts to see his situation from a different point of view. Last week he was ready to plan the yearly guys’ vacation he takes with his best buddy, but now things have changed.Max recognizes just how much he needs Nathalie’s humor, her organizing talent and her optimism, but also just how important to him she and his family really are. Max tries to discover the mysterious lover’s identity, but because of his new insight, he takes an additional step.Unfortunately, when he learns that the mystery man is Gregor, Max realizes that not only does the man have all those qualities - he is very attractive as well. His struggle to become a better husband and father suddenly becomes far more difficult.Hoping to knock Gregor out of the picture and get back in Nathalie’s good graces, Max makes an appointment with a successful life coach. But turning his life around is far more difficult than he had imagined.To make matters worse, Gregor turns out to be a loving, family-oriented man just what Nathalie needs. Max is desperate – he knows there is a real chance that he might lose Nathalie and the children.Willing to put everything on the line to keep his family intact, Max makes the biggest sacrifice of his life. Then something happens that is the very last thing he could have ever counted on…
