I hate it when people are driving in the left lane and they suddenly decided "Oh, I want to go over in that shopping plaza over there." So, they quick go across two lanes and cut right in front of you in the right lane to turn in. I had that happen yesterday.
I also hate it when people feel like they shouldn't have to work, but yet will complain that they are broke and don't have any money. I listen to this crap all day at work. I listen to people that don't won't to work evenings or weekends, but complain that they don't have enough money to pay their bills, they can't afford to take their kids to Mcdonalds, or that they have a piece of crap car that they have to keep pouring water into before leaving, so it doesn't overheat and blow up on the way home. People want to live the good life, they just they don't feel like they should have to work for it.