This was a good one, too. I liked when, during the fight with Zabuza and Haku, Naruto came up, loudly prouncing his arrival, and Kakashi told him that he should have stayed hidden. Then Sasuke is thinking about how he can get out of the Ice Mirrors, with Naruto's help from the outside. But THEN Naruto pops up behind Sasuke, INSIDE the Mirrors, and whispers, "Hey, Sasuke, I snuck in here so I could help you!" Or something to that extent.
In some ways, I wanted to scream, and in others (Considering the look on Naruto's face when he entered) I wanted to laugh. I guess it was a give and take situation.
The fight lasted several episodes, but this was a really good one. It was fun to see them fighting side by side, something that rarely happens. :D