The opening scene of The Dark Knight establishes the Joker as a character with an unclear identity due to his mask, leaving the audience with questions. It introduces the Joker, revealing his chaotic beliefs through dialogue and showing him to be mentally unstable through his actions and disheveled costume. The pace of the scene starts slow and builds to fast to establish the film will have intense slow and fast parts, with quick cuts creating tension. The unsettling, disorienting music and shifting high-key and low-key lighting set the movie's mood and tone.