The line comes from Batman, released in 1989, where Jack Nicholson's Joker uses the pale moonlight phrase as a sinister calling card, repeating words linked to the murder of Bruce Wayne's parents. It quickly became one of the film's most quoted moments and has since been lifted into fan edits, reaction videos and memes whenever a villainous or ominous character takes centre stage. Its staying power comes from that mix of elegance and menace: a beautiful image made threatening by who is saying it.