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Naruto is primarily a series about ninja-based political intrigue, but the Chunin Exams are a non-stop action thrill ride. They do a great job of introducing the characters and their abilities, and at hinting towards the dangers they'll face in the future. The Chunin Exams start with a written test, (where students are encouraged to cheat) then quickly progress to an obstacle course in the woods (that brings them in contact with the disconcerting villain, Orochimaru) and then, for those who haven't been disqualified, there's a final series of fights. 

Some fights are ridiculous - like the one where Naruto defeats Kiba by farting in his face - but others are exquisitely painful, like the emotionally fraught battle between cousins Hinata and Neji. The two of them attempt to resolve their deep-seated family issues by pummeling one another, in a battle that ultimately puts Hinata in the hospital.

The exam is eventually interrupted by the city being invaded, which only serves to increase the intensity of the series arc.