There are “worse-er” examples:
Recently, I had the pleasure of eating at a Burger King in New England. While I was there, one of the off duty employees came to pick up her check. The manager and the employees who were on shift began to compliment her on a new car that she had just purchased. Apparently, Burger King had been late with a few of her checks in the past. She made the following comment to her boss:
“If you’d have done paid me on time, I’d have been had it already.”

It’s because we think we can teach English without teaching CASE. You can’t. Our pronouns may be the last remnants of our once highly inflected language, but they persist and so case must be taught. It’s not at all difficult, for heaven’s sake – a piece of cake compared to other languages. I thank my mother for making me learn English grammar from an old fashioned book with parsing exercises and pronoun tables!

Well, actually, McCain, even you made an error here: “her/him” are 3rd person pronouns, not 1st person. Furthermore, “I” and “her/him” are not the same type of pronouns: the former is a subjective personal pronoun and the latter are objective personal pronouns. The 1st person objective pronoun is “me”, and the 3rd person subjective is “he/she”. “It” is a 3rd person personal pronoun which operates in both the objective and the subjective roles. OTOH, perhaps you were correct, but the way in which you expressed yourself was simply unclear? Perhaps you were complaining that people say, “Him and I went to the beach,” when they ought to have said, “He and I went to the beach.” If this is what you meant to say, then you ought to have stated that your pet peeve is when people misuse the third person personal pronoun.
McCain: No, my pet peeve is my pet peeve: when people say “I” when they should have said, “me.” In other words, what I posted. Now, “Kepler” I know you and a few of your playmates can’t contain your obnoxious streak toward me, and are still smarting over getting dinged on sanctification, which tells me the Law has had its way with you. That’s good. But if you can not conduct yourself on this blog site with a modicum of respect and courtesy, you will not be permitted to post here. Grow up please.

I so agree with your comment about the mis-use of English from the pulpit. Our Associate Pastor constantly says “Mary and I” when it should be “Mary and me” (as in “So-and-so gave a gift to Mary and I.” I cringe everytime he says it and want to holler out “me, me, me!” I sometimes visit a near-by PC USA church because I love to listen to their Pastor who has impeccable grammar (plus a very nice liturgical service, which is more than I can sometimes say about my own LCMS church).
McCain: I do not think attending a heterodox church body’s services because a pastor has better grammar than an orthodox preacher is justified. The PCUSA is way out to lunch.

I always cringe at misused reflexive pronouns. It goes both ways, too. People trying to sound more eloquent than they are will add them when they shouldn’t, and people who are trying to sound casual will take them out when they should use them.
Such as:
“When sending an interoffice memo, make sure to copy Linda and myself.”
and
“I got me a new TV.”
McCain: Oh, YES, “myself” used instead of “me” — drives me up the wall too. I don’t even like to be so put off by it, but whenever I hear these things it is like fingernails on a blackboard.

I am hesitant to share my pet peeves, lest I make a grammatical error in the process. However, I cringe at the disappearance of adverbs in common speech. I realize that some languages (German included) do not have them, but English DOES. I suppose it has been going on for a while though, even John Steinbeck mourned their loss in his book Travels with Charley that he wrote in the 1950′s.

Once, when Winston Churchill was addressing a crowd, a woman took him to task for ending a sentence with a preposition. Churchill replied, “Madam, that is the sort of nonsense up with which I will not put!” Proper grammar is a beautiful thing to hear, but every rule has its exception.

The last I checked, German had adverbs. Might some other grammatical form be meant? Gerunds, perhaps? The participle dominates German sentences to a degree hardly dreamed of on English. In German, infinitives function as a substantive verb form.

As an English teacher, I too am saddened by the poor grammar used throughout our nation. However, I also believe many Americans lack knowledge in manners and etiquette to the “nth” degree. This also contributes to the perception of Americans being “ugly” in the world arena.