One of the many types of people that annoy me is the Insufferable Know-It-All (aka IKIA). An IKIA is a person who brags about how smart and intellectual they are, which, unfortunately, they usually are. An IKIA gets A+'s in all of their classes (usually math or science) and their overwhelming curiosity demands to know the grades of everyone else. No one quite understands their need to know others grades, but all that can be said is THAT THEY NEED TO MIND THEIR OWN BUSINESS.
Seriously. Why do you care what grade I got on my science/math/English/etc. test? What does it matter to you? And don't you dare roll your eyes at me or sigh angrily when I refuse to tell you.
Another irritating trait of an IKIA is their belief that just because they get good grades, they are obviously deep. They believe that they understand everything. They understand life, they understand love, they understand other people's problems, etc. This trait eventually leads to the Emo Poet, but that topic is for another time.
From The Dictionary of Lacy:
Word: The Insufferable Know-It-All [in-suhf-er-uh-buhl-noh-it-awl]
-A really annoying person. Avoid with care.
Points if you got the Harry Potter reference :)