Here's a "good" one: Quotation marks
for emphasis. Makes me want to hurt somebody.
I do realize that English, even for native speakers, can be tricky. I pity those who take it on as a second language. I'm definitely a spelling and grammar freak, but I still have issues with little things like semicolons and ellipses. But the qotation mark thing is screamingly obvious (and the apostrophe thing, and ohboy, here I go!!)
I also get really worked up over misuse of "I" and "me". There's a reason why there are two pronouns you can use to refer to yourself in a sentence.
The rule I use for "I" and "me" is simple...
Take the other person (or people) out of the sentence, and say it aloud.
Do you now sound like Tarzan or Tonto?
If so, you need to use the other one.
As for "myself": no, it is not some kind of "formal" form of "me" or "I". I know it sounds classier, but seriously, that's not what the word is for. Same goes for "you" and "yourself". They both refer to someone being all alone. I know it's possible to find yourself surrounded by a group, but... OK, now, wait, that's different. Ummm...
That's English for you- there's all these weird exceptions. And I will admit, if I knock and someone says "who is it?" I will never say "It is I", even though that is correct. But if I'm talking about myself and someone else (correct use of "myself" there, BTW), you'll never catch me misusing "I" or "me".
Sigh... it's not easy for people like me... I started reading very early, always loved English classes in school, and stuff like that drives me up the wall. It gets worse and worse in this country every year, too...
)