* You're misremembering the line. There might be a similar phrase or a slightly different wording in a movie.
* The line is from a lesser-known film. It could be from an independent film, a foreign film, or a movie that hasn't achieved widespread recognition.
* The line isn't from a movie at all. It might be from a TV show, a book, a song, or even a real-life conversation.
To help me find the movie, please provide more context:
* What is the general theme of the movie? (Action, comedy, drama, etc.)
* Who might be saying the line? (A hero, a villain, a supporting character?)
* What is the context of the line? (Is it a threat, a declaration, a lament?)
With more information, I may be able to track down the movie for you.