Disclaimer: I do not own Itachi or Kisame or the Akatsuki leader.
Itachi and Kisame are walking down a path. "Hey, Itachi," Kisame says. "Look at this new weapon I got!" Itachi looks over. "It's a really big hammer! When you hit someone on the head with it, they get all wet! See?" Kisame hits Itachi on the head.
Itachi, now soaked with water, takes the hammer from Kisame. He hits Kisame on the head. Now they are both soaked. "This is the worst weapon ever," Itachi yells. "Why?" Kisame asks. "Because unless your opponent is made of fire, on fire, or using fire, it's useless!" Itachi responds. "So? It's funny," Kisame says. "No it's not!" Itachi says.
Itachi hits Kisame on the head with the hammer again. "See? Useless! It doesn't even hurt!" Itachi tells Kisame. "What if they were allergic to water?" Kisame asks. Itachi frowns. "Ha! I've finally fooled you," Kisame says. "No, I was just thinking about doing this!" Itachi says as he hits Kisame on the head once again with the hammer.
Kisame takes the hammer from Itachi. Kisame hits Itachi with the hammer. They continue to do this until the Akatsuki leader comes and takes the hammer away. The end.
No Akatsuki members were hurt in the making of this story.