Yeah, I have to agree with that chat-typing...drives me up the wall, too. Not to mention it really brings down someone's intelligence-level in my mind. No offence to anyone that does it, of course.
Like others have said, I'll do "lol" a lot, or I use "btw" sometimes, but in general, I would rather have absolute assurance that whoever is reading what I write totally understands what I'm trying to communicate. It's something I really concentrate on. What's the point of communicating if not everybody understands what you're saying?
I agree with the biting-the-fork-while-eating idea...that's quite annoying.
How about people that you have over for company that are still there on a weeknight at midnight, and not getting the hint that you are tired, and wish to go to sleep? I have that quite often...hehe...but my husband then just says, "Hey...when are you guys gonna leave?" He says it in a nice, joking way, and our friend gets the hint and says, "Wow...I didn't realize the time" or some such, and they leave shortly thereafter. But I've had other people before that just didn't get the fact that we have to work, have a young child, that it's LATE, etc. It's funny how people just aren't conscious of things like that sometimes.
Or slurpy drinkers? Or even people that slurp the last of their soup? Blech!!
Hehe...guess I have a lot when it just comes down to it...lol!!