Robots that call me on the phone warning that my auto insurance "may be expiring!" First of all, I have no auto, so if my auto insurance is expiring, I want to know why the heck I have it in the first place, not how to renew it. Secondly, if you don't KNOW whether it's expiring, you obviously have no business calling me about it.
Car stereos that create little earthquakes. They make me want to kill people. If it were up to me, it would be illegal to even manufacture car stereos capable of producing such loud noise. Loud motorcycles are almost as bad. (There are in fact laws against such noise where I live, but there's no enforcement.)
Animated gifs and flash ads. Thank goodness for ad filters, otherwise I would lose my mind.
90% of political campaign coverage. There are more articles talking about the amount of money each candidate has raised than there are about their policies. It's like off-season sports coverage, only without any humor.
And speaking of politicians, let me add one more: politicians. More specifically, the verbal dances they use to avoid answering simple questions. Why does this always work?! The debate moderators establish plenty of rules; why is "you can't change the subject" not one of them?