In episode 2, the samurai who gets in the spring with Jin starts talking about how fireflies mate, sometimes homosexually.
Samurai: [Enters bath and interrupts greetings to observe fireflies] Beautiful, aren't they? Do you know why fireflies glow like that? It's a form of communication. Signals sent by the males and females to attract one another. However, they say that every once in a while, a male will try to attract another male.
This... this girl's stomach is a Cosmos unto itself! It's connected to the void of the universe!
How much can a human being eat? One has to ask: Where have we been? Where are we going? Their forms are like unto the gods themselves! This is truly awe inspiring!
What we may very well be witnessing here today is a birth... the birth of the next stage in human stomach evolution.
"Something just popped out."
The beatboxing guy in episode 8. Drunk Jin is pretty hilarious, too. What tops both of these, though, is the end of episode 9. Mugen's trip (even if it's a little...excessive for weed) is only the beginning.
It was an entire field of weed; it's justified.
Hungover Mugen and Jin from episode 8 was funny as well.
Two Words: SAMURAI BASEBALL.
"Maijin Fuu". Whenever Fuu gets a chance to engorge herself with food, her entire body physically changes. She becomes so bloated, that in one episode, two men were searching for her. When they saw her (now back to normal size), they continued looking, saying that there was no chance it could have been her.
The plot in general for episode 15. It's amazing what Mugen will do to get some action.
The travellers in episode 16 who rap about Yoshitsune.
He's fat, he's fly, he's tall as the sky/Always grabs his rocks when the bitches walk by!
And the dude's so handsome all the bitches wanna pants him!
The end of the episode 18. He's graffitied everything Jin and Fuu own, including themselves and Momo (whom he has labeled "Animal").
Hell, "War of the Words" in general. What you have here is a graffiti rivalry of epic proportions and a Crazy Awesome teacher. I mean, he overpowers Mugen, lectures him on the disgrace of being an illiterate and forces him to CHUG a bottle of sake in a fit of drunk rage and then passes out with Mugen in a headlock. The next day, he KIDNAPS Mugen and forces him to learn how to read through a rousing motivational speech! And he's voiced by Norio Wakamoto!
When there's a graffiti battle going on, the teacher gets real pissed, but he's not mad at the graffiti. He's mad that the graffiti artists wrote the character wrong!