PP: The expression "quarter of" in reference to time, so non-sensical to me. I understand what people mean when they say it but I have real qualms with it.
PP: People, and high beams on their cars. There are appropriate times to use your high beams, these do not include residential neighborhoods with streetlamps or the highway.
Most annoying thing -ever-. I also find it annoying when someone leaves a tiny, tiny amount of juice or whatever left in a bottle - not even enough for half of a drink, and they put it back in the fridge. DRINK IT.