The memorable chest thumping/chanting scene with Matthew McConaughey and Leonardo DiCaprio in Martin Scorsese’s The Wolf of Wall Street was actually based on McConaughey’s own real life pre-filming ritual. McConaughey recalls, in an interview with Rolling Stone:
"That’s one of my rituals that I do before filming. It’s a humming meditation, and when I was in the middle of it, Leo interrupted and said, ‘What is that you’re doing?’ I told him I was just preparing for the scene and immediately he was like, ‘You have to do that in the scene!’ So I said all right. Little did I know that when I saw the final cut and it actually became the baseline for our story" (x).