Why might a writer start a story in the middle?

By comparing part 1 and 2 of polar opposites what does it mean by polar opposites

What is implied in this sentence from mark twain's "the £1,000,000 bank-note"? i was puzzled, and wanted to discuss the matter a little further, but they didn't; so i took my leave, feeling hurt and insulted to be made the butt of what was apparently some kind of a practical joke, and yet obliged to put up with it, not being in circumstances to resent affronts from rich and strong folk.

Have you ever thought you understood a person based on a story that you have heard about them? have you ever guessed about a person's personal life because of the clothes they wore? or, have you judged a person because of their friends? although classifying people in this way is typically discouraged, authors deliberately use your preconceived ideas to you form an opinion about the character or to at least have a better understanding. can you think of a time that you made a character call about someone based on external aspects? were you correct, or incorrect? has anyone ever made an incorrect assessment of you based on external aspects? write two paragraphs about it in your journal.