10 More Insane Rules Movies Weren't Allowed To Break

10. Only Deadpool Can Break The Fourth Wall - Deadpool & Wolverine

Last year's Deadpool & Wolverine marked the official debut of Ryan Reynolds' fourth wall-breaking motormouth in the Marvel Cinematic Universe, and despite some sceptical expectations to the contrary, he indeed rocked up in fully R-rated glory.

Many also wondered precisely how Deadpool would be integrated into the MCU given his tendency to address the audience with meta quips and gags - something the MCU is decidedly not known for.

And as director Shawn Levy revealed in an interview shortly before the film's release, himself, Reynolds, the screenwriters, and producer Kevin Feige agreed on a system whereby Deadpool would be the only character capable of breaking the fourth wall.

The purpose of this was to preserve Deadpool's stature as the only unreliable narrator, while ensuring that everyone else without this ability could be taken as seriously as possible and not reduced to a mere gag. From that perspective, it totally makes sense.

Hugh Jackman even initially suggested that Wolverine also break the fourth wall during the movie, only for the idea to be swiftly shot down as Reynolds explained the system to him.

It's fair to assume that this rule will remain in place for any future MCU films Deadpool appears in - most likely at least one of the two upcoming Avengers movies.