"Deadpool breaks the fourth wall. Wade Wilson never does."

That's how Deadpool director Tim Miller explains one of the character's quirkiest and best-known character traits in a new interview published by Empire magazine.

“Does he know he’s a comic book character in a comic book movie? Does he know that Ryan Reynolds is playing him, and that Ryan Reynolds also played Green Lantern? It’s a big rabbit hole, and we explore it pretty deep,” Miller says in the interview.

The most important thing, he said, was finding where the line was -- and ultimately they decided that it was basically a power, and that it shouldn't be used before Wilson gets his powers.