My department moved to a different location, which overall is a really good thing. The downside to it is that I now sit right next to someone who used to be a fair ways away from me. Because of this, I now realize that this person has some seriously annoying habits that I was not previously aware of. He is noisy overall, which I was somewhat aware of (for example, he practically screams when talking on the phone).
What I didn't realize was that he talks to himself all the livelong day. Sometimes it's in a whisper and sometimes in a normal speaking voice. Both are about equally irritating. When he's typing, which he does extensively as part of his job, he reads aloud to himself what he's typing. It never stops.
I'm this close to shouting "For the love of all that is holy, please SHUT UP."