George kills Lennie to spare him from a painful death inflicted by Curley and to prevent him from causing harm to others in the future due to his mental disability.
Jim's imprisonment on Silas Phelps's plantation is a lucky coincidence for Huck and Jim because it ultimately leads to their successful escape from slavery.
Meeting Clarisse affects Montag by causing him to question his beliefs and motivations, leading him to challenge his role as a fireman and rethink his place in society.
The narrator calls himself "an invisible man" because he feels that society does not truly see or acknowledge the experiences and struggles of black individuals."