Polysyndeton

polysyndeton: sentence that uses and or another conjunction (with no commas) to separate the items in a series. Polysyndeton appears in the form X ans Y and Z, stressing equally each member of the series. It makes the sentence slower and the items more emphatic than in the asyndeton

"Every little while he locked me in and went down to the store, three miles, to the ferry, and traded fish and game for whisky and fetched it home and got drunk and had a good time, and licked me."
                                                                                      -Adventures of Huckleberry Finn
                                                                                                   by Mark Twain

Huckleberry Finn is describing the habits of his abusive father here. Twain uses the polysyndeton to emphasize its normality. When Huck rattles it off like a memorized speech, the reader knows that the actions described are normal. This makes it all the worse as the reader realizes what a predicament Huck is in. The reader empathizes with Huck and beings to see his strength. Twain wants the audience to know that this was routine for Huckleberry Finn, and to feel sorry for him. He wants to make them cheer when he runs away, and cry when he is beaten; Twain is simply using the polysyndeton to manipulate the readers' emotions, and explain Huck Finn's situation.