The Law of Additive Annoyances

Everyone has little annoying things that they do which you probably could do without.  But we handle them because, we know we have them too.  But sometimes, there is a person who has so many, that suddenly everything they do drives you nuts.  Even just small things that they do, which normally wouldn't really bother you, start driving you insane!  I call this the Law of Additive Annoyances.  And God help you if the person who sits in the cube next to you fits into the category.