In The Columbia Guide to Standard American English, Kenneth G. Wilson provides a succinct explanation of double negatives: "Most kinds of double negative are inappropriate in spoken and written Standard English except in jocular use . . .. This was not always so, however, and the double negative remains one of the best illustrations of what was once a perfectly acceptable locution being driven by the decisions of grammarians, not out of the language, but out of Standard use."
Quote of the Day: In life two negatives don't make a positive. Double negatives turn positive only in math and formal logic. In life things just get worse and worse and worse. --Robert McKee