巴克(约翰·坎迪 John Candy 饰)是一名快乐的单身汉,既然一个人生活,那么在日常中,他难免会大大咧咧笨手笨脚些。本以为一个人的生活会一直持续下去,谁知道某一日,哥哥鲍勃(加勒特·布朗 Garrett M. Brown 饰)和嫂子辛迪(Elaine Bromka 饰)邀请他到他们家做客,并且将他们的三个孩子托付给了巴克照料。很快,巴克乐呵呵的个性便得到了年幼的梅兹(盖比·霍夫曼 Gaby Hoffmann 饰)和迈尔斯(麦考利·卡尔金 Macaulay Culkin 饰)的喜爱,只有正处于叛逆期的提亚(珍·路易莎·凯利 Jean Louisa Kelly 饰)依然对他十分的戒备和抗拒。但是没有关系,真诚总是动人的,随着时间的推移,巴克和三个孩子之间产生了真挚的感情。
In 1672, two witches (Jennifer and her father Daniel) were burned by puritan Jonathan Wooley. In revenge, Jennifer cursed all future generations of the Wooley family, that the sons will always marry the wrong woman and be miserable. In the 20th century, a bolt of lightning frees Jennifer and her father from the tree that had kept their souls imprisoned. Jennifer assumes corporeal form and decides to make up-and-coming politician Wallace Wooley, then unhappily engaged, even more miserable by getting him to fall in love with her before his wedding. Wallace is a straight arrow, though, and Jennifer has to resort to a love potion. As we all know, love potions tend to backfire, with comedic results.
风尘女子凤姐遭逢死劫,于是拜托疯疯癫癫的命理大师老许(林家栋 饰)帮忙化解,怎奈命中注定,难改半分。狂风暴雨之夜,凤姐还是遭到雨夜屠夫的残忍杀戮。机缘巧合,茶餐厅送外卖的小哥阿东(杨乐文 饰)意外撞见凶案现场,满地血泊勾起了他心底最为阴暗凶残的欲望。救命来迟的老许懊恼之余,发现阿东的诡异之处。事后他找上门来为阿东算命,得知对方受风水等方面影响,注定性格凶残,并且还会因为杀人遭受二十年的牢狱之灾。为了救助这个青年,老许决定再次为他逆天改命,哪曾想出师未捷,各种厄运也接二连三向老许袭来。正所谓万般皆是命,半点不由人……