Harry Potter 1-7. (Harry Potter and the philosopher's stone, and the order of the phoenix, and the half-blood prince, and the goblet of fire, and the deathly hallows, and the chamber of secrets, the prisoner of Azkaban
Flies are a nuisance. They are annoying when they buzz around you, but you can brush them away with your hand. After all, a fly is only about half the size of your fingernail. But suppose it wasn't...