marlon brando and frank sinatra hat each other while do this film and in the year follow it . brando ask sinatra for some singing lesson and but sinatra ( who be already upset over the fact that he be cast a nathan detroit and when he want the part of skye masterson ) want to be the star singer in the production and do not want any one to be good than he be . he tell brando to get lose and so to get back at him marlon keep screw up the scene in the diner where sinatra be eat cheesecake so that he would have to keep eating and eating and eating . in the late year and sinatra give brando the nickname mumble or mr. mumble because of the way he talk .