Some rules of English grammar that should be dropped.

1.  Eliminate the insistence on "complete sentences."  Sometimes sentence fragments are just fine and in fact effective.

2.  Stop fussing about correct use of pronoun case.  "Me want a cookie!"  is wonderful.  Of course in that case humor is intended, but a sentence like, "She gave pencils to Mary and I" has the benefit of avoiding the alliteration and is not usually misunderstood, sounds natural, and even if it is a case of being "over-correct," so what.

3.  In that vein, the language should eliminate "whom" except as object of a preposition (where "who" still is distractive).

4.  Ban "shall" from legal documents.

5.  In fact, only allow "shall" in the polite request, "shall we" to keep the distinction between it and the question "will we?"

6.  Stop being so fussy about agreement between subject and verb.  All kinds of subtleties would become possible if the rules weren't so rigid.

7.  Change the punctuation rules at the end of the sentence to be logical by stopping the insistence that closing quotes must be outside the end-of-sentence mark.

8.  Drop the fussing about comma splice and other uses of the comma and make its use optional depending on need for clarity and style.

9.  Agree that a period is optional after common abbreviations such as "Mr".

10. Don't worry about dangling participles.  So what if someone can read it in a ludicrous way -- they won't, and if they do that's their problem (or maybe gain in pleasure). 

11. Allow use of a period rather than a question mark except for sentences intended to be questions but are not grammatical questions.  "Are you happy."  "You are happy?"  Rhetorical questions should also not need a question mark.  (Basically that would mean the question mark would indicate up-tone).