They're the most annoying bug in existance. Why? because you'll sit there working on something in complete silence and somehow it makes its way into the room. Out of all the places it could fly about in the room, it chooses to fly right next to your ear and scare the living shit out of you because at first you have no idea what that noise is, all you know is something's buzzing.

Then, after you discover its just a fly, you get up and try to find the fly swatter. Not too annoying until...