In "A Good Day to Die Hard," Lucy McClane told John McClane to "try not to make an even bigger mess of things." The line comes as John is preparing to leave for Moscow, where he intends to help his estranged son Jack, who is being held in a Russian prison.
Lucy is John’s daughter and had already seen enough of his tendency to rush into dangerous situations. Her remark is a dry, exasperated warning that reflects the family’s familiar frustration with John’s impulsive heroics. Mary Elizabeth Winstead reprised the role of Lucy after appearing in "Live Free or Die Hard."
The film, released in 2013, shifts the franchise’s action from the United States to Russia. John’s trip quickly becomes more complicated than a simple family rescue, involving espionage, political intrigue, prison escapes, and large-scale destruction. A common mix-up is attributing the line to Jack, John’s son, because Jack is the central family member accompanying him through much of the story. The quoted speaker, however, is Lucy.