People

I've worked in the customer service industry for some years now, and consequentially I've developed quite a cynical attitude towards "people". I say "people" because I'm really only talking about customers. Now I know that working means that I'm getting paid to perform a certain task, and if I don't like it, I can quit... but as a human being, if you don't like abiding by simple practices in etiquette, you can keep your disgusting ass at home! I'm talking about when I found a Pokemon Beanie Baby half covered in shit... not as in "stuff", but as in human shit! I can't name a wage that would justify putting up with shit like that (excuse the pun). I'm talking about when my coworkers at the video store found video tapes in the return box covered in vomit!
Now, granted, those are the extreme cases (but, sadly, true), but I still can't help but getting annoyed when, at my current job, I still get people who leave their chewed wads of gum on their trays for me to find as I'm wiping them down... or when someone finds nothing wrong with pulverizing a piece of cheese onto the table before they leave. And for chrissakes push in your damn chair!!!!
I don't particularly feel like it's my calling in life to educate the socially inept masses... but I guess it has to start somewhere. So, kids, here's a little lession from your Aunt Maria: when you get up from a table, place your little paw on the back of your chair (you know, where you've had your ass parked for the last 45 minutes), make a little pushing motion, so that the legs of the chair scoot across the floor, and feel free to stop once the seat of the chair is fully beneath the table.
Customer Service employees around the world thank you for your efforts.

And while we're on the subject of things that are annoying...
Okay, I have a cell phone. In fact, I think I was one of the first people I know to get one, so it's been about 5 or 6 years now. But I still can't help but get irritated by people with cell phones, espcecially on campus. If you can't make the short walk between two buildings without whipping out the Nokia and finding someone to talk to... you better make that call to a shrink because you must have some serious abandonment issues. Not to mention walking while you're talking is almost half as bad as driving while you're talking, because most people don't pay attention to where they're going. So if you get plowed over by a bus because you were giggling on your phone instead of looking both ways before you crossed, you deserved it.
In all fairness, I will admit that I've been guilty of this in the past...
but once I realized that I looked like an ass, I quit.