Things that really get on my nerves:
People who sit in their cars out on the street with their radio WAY up.
People who seem to think that someone on crutches should be the one to give way when walking down a sidewalk/hallway.
Honking repeatedly for someone to come out of a house - at 6AM!!!
People who talk on their cell phones in a movie theater - so what if it's only the previews!?
Please, please, please - just SHUT UP, HANG UP, AND PAY ATTENTION WHEN YOU DRIVE. The life you save COULD be your own!
Children in restaurants whose parents haven't taught them that sitting quietly is the proper behavior. Letting your child run around other peoples' tables is NOT acceptable.
Pedestrians who think that they can cross the street any-bloody-where they want too. Crosswalks are there for a REASON.
......and probably many other things...gimme some time to think.