Samuel Langhorne Clemens (Mark Twain) uses a fine humor style which is easily detected in extracts like:
<em>"Thish-yer Smiley had a mare; the boys called the fifteen minute nag(...) for all she was so slow and always had the asthma, or the distemper or the consumption, or something of that kind."</em>
<em>"...And he had a little small bull pup, that to look at him you´d think he warn´t worth a cent(...) his underjaw´d begin to stick out like the fo´castle of a steamboat..."</em>
<em>"...He ketched a frog one day, and took him home, and said he cal´klated to edercate him(...) and you bet you he did learn him, too.</em>
Twain is satirizing several aspects of American life, but specially the country "punks" who tend to speak at length about subjects that are close to them but are really unimportant an nonsensical.
Quickly, fast, slowly, carefully
Minimal eye contact would not help establish a strong ethos, as it gives the impression you are not confident in what you are talking about.
An introduction comes at the beginning and introduces the subject. While a conclusion comes at the end and concludes the subject. I hope this helps.
