One of the biggest disappointments in The Avengers was the fact that the iconic "Avengers Assemble" line was never said by one of the movie's heroes. It's the classic call to action in the comic books, but Joss Whedon for some reason decided not to include or even allude to it. However, Chris Evans is clearly a fan as the actor would use "Avengers Assemble" in texts to cast members when he wanted to hang out with them. This shows the camaraderie of the actors and hopefully they're all big enough fans of the catchphrase to have forced Whedon to include it in Avengers: Age Of Ultron.