Watching the full cast of Avengers: Age of Ultron goof off behind the scenes is almost better than the movie itself. Given the amount of time Robert Downey Jr., Scarlett Johansson, Chris Hemsworth, Mark Ruffalo, Chris Evans, and Jeremy Renner have spent filming various Avengers flicks, they're pretty comfortable with each other by now.
The Age of Ultron gag reel is evidence of that—a full 10 seconds of the 3:31 video is devoted to the actors pretending to make out with each other. The reel was scheduled to be released along with the film itself on DVD and Blu-Ray this October, but a Tumblr user got ahold of the footage and posted it early.
In the reel we see Ruffalo repeatedly flub a line about big, scientific words, Hemsworth trip over his own cape, and Evans completely forget how to call the team into action (hint: try saying, "assemble"). Johansson and Samuel L. Jackson also get their moments to shine, and so does CGI Hulk, who sort of kind of misjudges a heroic leap.