People talking loudly on their cell phones in the store!!
Talking on cell phones in nice restaurants!
If you're gonna talk on the phone all through your (and mine) dinner, go to McDonald's or some cheapass cafeteria where noise is part of the ambiance to begin with... I don't wanna pay top dollar for my nice cut of steak and nice wine and have to hear some dumbass talking on the phone.
And that goes for driving too. Put the phone down and drive. Best bumper sticker I've seen in a while: "I bet you can drive better with that cellphone shoved up your ass"