In the beginning of Edgar Allan Poe’s “The Tell-Tale Heart”, the main character is pretty nervous. This can be figured out by simply evaluating and reading the first paragraph of the story. There is a lot of repetition of “ill” and “mad”. When repetition like this happens, it’s often because the person speaking is nervous.
A nervous habit of repetition could mean that this person has more than just a bit of lunch on his mind. This typically denotes that the person is hiding something. It may be a secret or something worse.
Furthermore, as you read the story, you find that he had good reason to be nervous. That said, I won’t spoil the story for those who haven’t read it before.