This Halloween the most popular mask is the Arnold Schwarzenegger mask. And the best part? With a mouth full of candy you will sound just like him.

O’Brien’s joke hinges on two familiar pop-culture touchstones: Halloween costume trends and Arnold Schwarzenegger’s instantly recognizable accent and speech patterns. By calling the Schwarzenegger mask “the most popular,” he sets up an exaggerated premise typical of late-night monologues. The punchline—“with a mouth full of candy you will sound just like him”—adds a physical gag: candy-stuffed speech becomes a comic stand-in for Schwarzenegger’s distinctive diction. The humor is affectionate parody rather than critique, using impersonation as a shorthand for celebrity identity and showing how easily a public persona can be reduced to a single audible trait.