Did you know that Marvel's "The Avengers" was initially given an R rating by the MPAA... TWICE.
Speaking with with Movies.com, Marvel Studios President Kevin Feige says: "When we submitted The Avengers, the first couple cuts of it came back from the MPAA rated R. That happened twice. So we went back and had to make adjustments."
So what was the cause of the rating? The demise of Agent Coulson was the big problem: "Whenever you impale somebody from their back and the blade comes out their chest, there are issues".