People clicking pens. Seriously, we get it, you're bored or something, go do a crossword. And it's way worse when another person picks up on it and starts doing it too. Ugh. Two of you now? Then the entire room starts doing it and it sounds like a billion woodpeckers have flown into the room and have started pecking the sides of my head.
I hate the manager of my local sports team and wish for the immediate termination of his employment (if not public flogging) with literally every fiber of my being (IMG:[invalid] style_emoticons/default/smile.gif)