The line comes from Night at the Museum, the 2006 fantasy comedy in which a night guard discovers the exhibits in a natural history museum coming to life after dark. As a short, self-contained quote, it was easy to lift from the film and share on soundboards and in short videos, where the wording alone carries the joke without needing the surrounding scene. It has stayed in use because the phrase is familiar, blunt, and flexible, working equally well as encouragement, teasing, or mock toughness whenever a clip needs a quick spoken reaction.