杰克(艾迪·墨菲 Eddie Murphy 饰)有一张刀子嘴,为了达到目的,他什么样的话都能说得出口。因为这张嘴,他失去了许多的朋友却并不以为意。一日,杰克的诳语得罪了辛加博士(克利夫·柯蒂斯 Cliff Curtis 饰)——一位神秘的宗教领袖,为了让杰克明白自己的缺点,他召唤来了一颗菩提树。 辛加告诉杰克,菩提树上有一千片叶子,杰克每说一个单词,就会有一片树叶凋落,当树叶掉光之时,就是杰克的临终之日。突然被剥夺了自由说话的权利的杰克痛苦不已,失去语言的庇护反而让杰克懂得了“谨言慎行”的真正含义,随着时间的流逝,杰克也开始明白,有些话不能乱说,可是有些话却不能不说。Jack McCall, played by Eddie Murphy, finds an unusual tree in his yard after an encounter with a spiritual guru. After discovering that with each word he speaks, a leaf drops off of the tree, Jack refuses to speak at all, as doing so will keep the tree, and him, alive. However, his work, marriage, and friendships are all affected by his choice. Can Jack figure out an alternative method of survival? Or will he simply have to live the rest of his life to the fullest?