At the end of the movie when Ethel Merman is singing the number and her son (Donald O'Connor) who has been missing for a year shows up. Her family is on the side of the stage trying to get her attention that he is there. She looks over and sees him, and stops for a spilt second. Then she finishes the song without missing a beat. She then rushes off stage to hug him. That one scene is a microcosm of the life in show business. She kept her composure and finished the song under the most difficult of circumstances. Merman's character exemplifies what being in the industry meant to people. Thus the title of the movie.
