What is the main thing Batman always says in his film?

There's no single phrase Batman always says in his films. He's known for his gruff demeanor and often speaks in short, pointed sentences.

Here are some of his most iconic lines, but none of them are said in every film:

* "I'm Batman." - This is a classic line, but not used in every film.

* "I'm vengeance. I'm the night. I am Batman." - This line is from the 1989 film.

* "Why so serious?" - This line is from *The Dark Knight* and is iconic, but not a regular saying.

* "I'm not a hero." - This is a common theme in Batman films, though the exact words vary.

While Batman doesn't have a signature catchphrase, his dark, brooding tone and focus on justice are consistent across most of his cinematic appearances.