What's your pet peeve?

pet peeves? I get aggravated when someone is talking on their cell phone while driving.

Out of behaviors? I'd say just not having any manners. Not knowing when to say thank you, please, excuse me..they aren't hard to do or anything. I can't understand why it is people don't do them. They make all the difference when interacting with others though. It really drives me nuts when I hear someone belch and they don't say excuse me, or people just assuming you'll do something without saying please or thank you afterwards. To me it's all just rude.