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　　邓小龙（许冠英 饰）从小就为人正直、乐于助人，他的志愿就是长大了能当一名除暴安良的好警察。无奈天意弄人，他因身材矮小，而且天生色盲，于是被警局拒之了门外，他只好去保安公司当了一名护卫员。保安主管周世昌（许冠文 饰）是一名老油条，为人尖酸刻薄、贪生怕死。下属阿Sam（许冠杰 饰）一早就看他不顺眼，只是有冤无处申。
　　这次，公司的太子王平凡从国外留学回来，假扮保安混进了公司考察情况。不久阿Sam和小龙就因工作出色而获得提拔，而周世昌却被剥夺了主管之位降职任用，还有几个月就可以退休享受的他会为了退休金忍下这口恶气还是会另有所谋？

　　Wealthy Rollo Treadway (Buster Keaton) suddenly decides to propose to his neighbor across the street, Betsy O'Brien (Kathryn McGuire), and sends his servant to book passage for a honeymoon sea cruise to Honolulu. When Betsy rejects his sudden offer however, he decides to go on the trip anyway, boarding without delay that night. Because the pier number is partially covered, he ends up on the wrong ship, the Navigator, which Betsy's rich father (Frederick Vroom) has just sold to a small country at war.
　　Agents for the other small nation in the conflict decide to set the ship adrift that same night. When Betsy's father checks up on the ship, he is captured and tied up by the saboteurs. Betsy hears his cry for help and boards the ship to look for him, just before it is cut loose.
　　The Navigator drifts out into the Pacific Ocean. The two unwitting passengers eventually find each other. At first, they have great difficulty looking after themselves, but adapt after a few weeks. At one point, they sight a navy ship and hoist a brightly-colored flag, not realizing it signals that the ship is under quarantine. As a result, the other vessel turns away.
　　Finally, the ship grounds itself near an inhabited tropical island and springs a leak. While Rollo dons a deep sea diving suit and submerges to patch the hole, the black natives canoe out and take Betsy captive. When Rollo emerges from the ocean, the natives are scared off, enabling him to rescue Betsy and take her back to the ship. The natives return and try to board the ship. After a fierce struggle, Rollo and Betsy try to escape in a small dinghy. It starts to sink, and the natives swiftly overtake them in their canoes. Just when all seems lost, a navy submarine surfaces right underneath them and they are saved.

　　杰克（小罗伯特·唐尼 Robert Downey Jr. 饰）仗着自己英俊的外表整日沉迷于美色之中并引以为傲。一次偶然中，杰克在酒吧中邂逅了名为兰迪（莫利·林沃德 Molly Ringwald 饰）的女孩，他深深的被这个自信又热情的姑娘所吸引，两人一拍即合相谈甚欢。然而次日，兰迪对杰克的态度却来了个一百八十度的大转弯，百思不得其解的杰克找到了兰迪的住所，才发现兰迪的父亲是一个赌鬼，背负的巨额债务。
　　为了给父亲还债，兰迪不得不向富翁费尔南多（鲍勃·冈顿 Bob Gunton 饰）寻求帮助，费尔南多要求兰迪那她的身体来交换。杰克提出自己可以帮助兰迪，但遭到了后者的拒绝，兰迪远赴大西洋城，想在赌桌上试试手气。