people that don't indicate - it's a lost art
People who make a noise when they yawn, like the standard "AHHH" thing (hard to describe in words). Really. REALLY annoys me.
Tangled up wires!
I am a very patient person, but I have broken many electrical items by throwing them at the wall when the wire gets caught in something. Yesterday the wire from my newish headphones got caught in the wheel of my chair and after a few seconds of trying to untangle them I just completely lost it and threw them as hard as I could at the wall and then left them(they seem ok though
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Niggly things like that drive me totally mad!