“Because I’m Batman” is a widely recognized Batman-related punchline rather than a phrase tied reliably to one confirmed screen scene. It grew through online parody, image macros, fan videos, and short reaction edits that exaggerate the character’s ability to prepare for every situation. The joke draws on Batman’s identity as Bruce Wayne and his reputation for intelligence, wealth, gadgets, and extreme confidence. Its simple setup-and-answer structure remains useful because audiences understand the reference immediately, even without additional context.