Odd-in-Yumi's-body: And if you hadn't noticed, I have a dynamite body! Better than yours. There... for example... (scratches his/her back) something's itching me in my back. It's a... I think it's the strap to your... hmm? Yumi-in-Odd's-body: DON'T YOU DARE TAKE IT OFF, YOU HEAR!?
Same episode, Odd messing around with Yumi's body, flirting with Ulrich just to mess with Sissi (leading to a hilarious misunderstanding when Sissi leaves Yumi in Odd's body with a message about it for Ulrich), coming at school disguised as a Neko-girl and leading to a photo of Yumi and Ulrich together in the newspapers. Cut to Yumi's reaction at the end of the episode:
In one episode, Sissi, after being scared by one of XANA's specters, is sent by Ulrich to hide in his and Odd's room. Cue Odd partially awaking and noticing Sissi:
Odd: Uh? What's that? A dream? Sissi: Oh, Odd, I'm so scared! May I sit next to you? Odd: Oh, okay, it's not a dream, it's a nightmare... I'm going back to sleep!
Odd ending up cloned in three, and the numerous resulting gags.
All of XANA's xanatified victims in "Bad Connection". They're just so hilariously DUMB.
In episode 49, the gang finds themselves without weapons in Sector 5. So how does Odd take out a Creeper? Improvised boxing match, complete with sound effects!
Practically everything William clone says. The line he delivers in front of William's parents take the cake:
"To be specific, I'm a digitally-generated random polymorphic energy field controlled by a basic non-evolving behavioral program."
In the episode Contact, Milly asks Sissi to sum up the plot of the movie for the Kadic News:
Sissi: Uhm...well, that is...uh...its a love story, and at the same time it's a thriller with suspense! And of course, it's got a good dose of psychology, andandand...and it's very funny! A real comedy, and quite satirical.