Film Aesthete on Instagram: "During an interview, Jon Bernthal revealed that the iconic “Sell me this pen” scene wasn’t scripted at all. Leonardo DiCaprio improvised it on the spot after hearing a story from his security guard a former NYPD detective who said Jordan Belfort had once tested him in a real job interview by handing him a pen and saying, “Sell this to me.” Bernthal and the rest of the cast had no idea it was coming, so all their reactions in that moment are completely genuine Movie :