Naruto - Episode 30: "The Sharingan Revived: Dragon Flame Jutsu!"
That's not what happened, because Norio Matsumoto got assigned this episode.
If you know the name, you already know where this is going. Matsumoto is one of the most celebrated sakuga animators in the industry, and episode 30 is one of his earliest and most unhinged calling cards. The second Orochimaru starts trading blows with Sasuke, the model sheets go out the window. The rigid, clean lines from the academy episodes melt. Character proportions get loose and sketchy and alive. When Sasuke sprints through the canopy dodging fireballs, his body elongates and the background plates smear into impressionistic streaks of forest green. It looks like the animation is trying to keep up with the fight instead of containing it.
The Dragon Flame Jutsu sequence is the centerpiece and it earns that status. The line-weights on the ninja wire tightening around the tree trunk are razor-sharp. The fire doesn't look like a generic orange glow sitting on top of the frame. It has weight. It explodes along the wires with a violent, flickering, hand-drawn density. This is three minutes of a studio sacrificing budget to the anime gods and getting their offering accepted.
Then there's Orochimaru himself.
People forget how genuinely wrong this man is in the Forest of Death. Not villain-wrong. Wrongness as a fundamental condition of being. He peels his own face off. He extends his neck at an angle that implies his skeleton has filed for divorce from the rest of him. He crawls on all fours like something that only learned about human movement from a pamphlet. And after all of that, his tactical solution to acquiring Sasuke Uchiha is to unhinge his jaw and bite a twelve-year-old in the neck at a municipal exam. Sir. There are proctors.