Narrator

In "The Tell-Tale Heart", the author shows that the narrator is not reliable by saying in the beginning that how much the main character says that he's not mad, just nervous. But to us readers, we all think that he's not only mad, but insane already. Who would spend one whole hour just sticking their head into a door? Who would want to murder a nice old man that treats them really nice, just because they have eyes that scares them? Who would do such things that are so weird? Only people that are weird will do things that are weird. The author purposely chose to create a narrator that isn't reliable because it's a part of the plot and it's a thing that the author wants us to think about throughout the story. In real life, you can see that a person isn't a reliable when you look at their facial expressions and how they are acting. For example, it would probably be obvious to see when a person is lying. Well, not for all people, but for a lot of people, they will start to act nervous, and they will be scared to look at your eyes, and will start to have some small but rapid actions going on.