In no particular order, here are some of the events I always discuss most with students:
Bob Ewell signs his name during trial: At this moment, we learn that he is left-handed. Equally important here is the fact that Tom's left arm has been so injured that he can no longer use it. Therefore, it is impossible that Tom caused Mayella's injuries, making Bob the likely suspect.
Bob threatens Atticus: After the trial, Bob Ewell is not happy with Atticus for defending Tom and bringing his family's true nature to the forefront of town knowledge. He stops Atticus on the post office corner one morning, spits in his face, and swears to "get him" if it takes the rest of his life. Atticus doesn't seem overly bothered by this and never seems to consider that Bob will choose to "get him" by going after Scout and Jem.
Scout and Jem are attacked : After the play, Bob makes good on his threat and tries to kill Atticus's children. The children have no idea who he is in the dark, and Bob would have succeeded if...
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