How Easy???

You find yourself in the train on your way home after a stressful day...You open your bag and pull out pages that can take you out of the world with its words. But all of a sudden the door opens and you find yourself hearing loud voices instead of the peaceful sequence of that story that had you so intrigued...After raising your head with the distraction...How easy is it to get back to the story???? Would you rather close the book or try to just mute everything else going on around you??