I've actually blogged about this list before, but didn't know its provenance (or have the full quota) until I came across an entry on it via the excellent LISTS OF NOTE:

Late-1979, New York Times columnist William Safire compiled a list of "Fumblerules of Grammar" — rules of writing, all of which are humorously self-contradictory — and published them in his popular column, "On Language." Those 36 fumblerules can be seen below, along with another 18 that later featured in Safire's book, Fumblerules: A Lighthearted Guide to Grammar and Good Usage.
Trivia: Safire previously worked as a speechwriter and was, in 1969, responsible for penning Nixon's thankfully unused and incredibly chilling, "IN EVENT OF MOON DISASTER" speech.
(Source: Maximum Awesome; Image: William Safire in 1968, courtesy ofNYTimes.)
- Remember to never split an infinitive.
 - A preposition is something never to end a sentence with.
 - The passive voice should never be used.
 - Avoid run-on sentences they are hard to read.
 - Don't use no double negatives.
 - Use the semicolon properly, always use it where it is appropriate; and never where it isn't.
 - Reserve the apostrophe for it's proper use and omit it when its not needed.
 - Do not put statements in the negative form.
 - Verbs has to agree with their subjects.
 - No sentence fragments.
 - Proofread carefully to see if you words out.
 - Avoid commas, that are not necessary.
 - If you reread your work, you can find on rereading a great deal of repetition can be avoided by rereading and editing.
 - A writer must not shift your point of view.
 - Eschew dialect, irregardless.
 - And don't start a sentence with a conjunction.
 - Don't overuse exclamation marks!!!
 - Place pronouns as close as possible, especially in long sentences, as of 10 or more words, to their antecedents.
 - Hyphenate between sy-llables and avoid un-necessary hyphens.
 - Write all adverbial forms correct.
 - Don't use contractions in formal writing.
 - Writing carefully, dangling participles must be avoided.
 - It is incumbent on us to avoid archaisms.
 - If any word is improper at the end of a sentence, a linking verb is.
 - Steer clear of incorrect forms of verbs that have snuck in the language.
 - Take the bull by the hand and avoid mixing metaphors.
 - Avoid trendy locutions that sound flaky.
 - Never, ever use repetitive redundancies.
 - Everyone should be careful to use a singular pronoun with singular nouns in their writing.
 - If I've told you once, I've told you a thousand times, resist hyperbole.
 - Also, avoid awkward or affected alliteration.
 - Don't string too many prepositional phrases together unless you are walking through the valley of the shadow of death.
 - Always pick on the correct idiom.
 - "Avoid overuse of 'quotation "marks."'"
 - The adverb always follows the verb.
 - Last but not least, avoid cliches like the plague; They're old hat; seek viable alternatives.
 - Never use a long word when a diminutive one will do.
 - Employ the vernacular.
 - Eschew ampersands & abbreviations, etc.
 - Parenthetical remarks (however relevant) are unnecessary.
 - Contractions aren't necessary.
 - Foreign words and phrases are not apropos.
 - One should never generalize.
 - Eliminate quotations. As Ralph Waldo Emerson said, "I hate quotations. Tell me what you know."
 - Comparisons are as bad as cliches.
 - Don't be redundant; don't use more words than necessary; it's highly superfluous.
 - Be more or less specific.
 - Understatement is always best.
 - One-word sentences? Eliminate.
 - Analogies in writing are like feathers on a snake.
 - Go around the barn at high noon to avoid colloquialisms.
 - Who needs rhetorical questions?
 - Exaggeration is a billion times worse than understatement.
 - capitalize every sentence and remember always end it with a point