People who blatantly "borrow" from popular tv shows for forum post titles. Oh, and lawyers who can't see the problem with the infringement of the 2nd amendment.
People talking on their cell phone in a public restroom.
Unless you are a cardiologist walking someone through CPR on the phone, there is nothing that can't wait until you are done taking a whiz.
I have worked retail for a few years and nothing ticks me off more than someone talking on their cell phone while at the register. I am getting to the point that I am going to wait for people to get off of there phone. It can wait!
Drivers who think they're too cool to use headlights at night and instead use only fog lights. Most of the time it's a Dodge Ram owner, but not always.