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The changing mood is when the narrator loved the old man and then the old man's eye started to vex him and he ended up killing the man.

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in the end of the story he thought he heard the old mans heart beat but it was his own and then he started freaking out and told the police that he killed the old man and that he was under the floor boards.

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One thing about being over confident is once you have it you think you can do anything

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The narrator hated the eye. so he killed the old man due to his obsession

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Doing Dumb things will make you feel guilty

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Doing Dumb things will make you feel guilty

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don't kill people

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One irony is that he insures he is not mad but his actions show he is

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When you are obsessed with something it takes over your whole life.

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don't kill people because of the way they look

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Being overconfident can backfire.

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Even though you may think you wont break, one action can cause you to tumble.

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What changed the mood was how the old man woke up that one night and he was more careful and didn´t move.

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When being overconfident you can take things too far.

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chopped up the guy and hid him under the floor board

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its ironic thta he confessed to the cops 

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its ironic thta he confessed to the cops 

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A irony is that the narrator confessed because he thought the police heard the heart beat.

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He was very kind to the old man but ended up killing him because of the eye.

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People are often not what they appear to be.

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Being overconfident can backfire on you.