As we all know, making a movie is a wonderous and complex process. It is much, much more than the simple equation of script + actors + director + celluloid = film. There are quite a few less tangible elements at play–a certain chemistry, a mysterious magic, a beautiful synchronicity that occurs when great artists converge to create something worthwhile together.
Of course, as was the case with Lily Tomlin and David O. Russell on the set of I Heart Huckabees, sometimes it can just be everyone yelling, throwing parts of the set around, and calling each other "cunt":
More context (and another clip of Tomlin just fucking trying to stay true to her fucking craft for God's sake) here.
The highlight for me is when Russell walks off the set in a huff, and then storms back in through a different door, still yelling. No matter what you think of Russell as a director, that moment couldn't have been choreographed better.