Hints and Foreshadowing

In the story "Tell-Tale Heart", the man said that he is dreadfully nervous, but not crazy. As we read, we it is quite obvious that he is a mad person. He has actions that the reader could tell that he is crazy, such as he killed an old man who is very nice to him, and that he confessed right after he killed the old man. These things are enough to make the reader thinks that he is crazy. In the opening paragraph the author described the crazy man in a way which is very abnormal. In the paragraph it says that "True! nervous very,very dreadfully nervous I had been and am; but why will you say I am mad?". It foreshadows that this story would include some scary parts and probably killing. This foreshadow can make the reader feel the mood of the story, which is more of a scary and mysterious mood.