Ulrich: What about Mrs. Hertz? Hasn't she got a new haircut? Yumi: No.
The Kankrelats in episode 11. They still are the comic relief amongst the monsters, slamming into each others (twice) or tripping themselves.
Odd jokingly making his "will" in case he's drained of code. He'll leave his basket of dirty laundry to Yumi. She'll know what to do with it.
"Chaos à Kadic"
Jim announcing to Mr. Delmas that they've received a thousand pink flip-flops (size 38) thanks to XANA making their computers bug.
What, Mr. Delmas announcing that they received 1,000 kilos of hay to Mrs. Hertz not funny enough?
"Un avenir professionel assuré": Odd is piloting the Skid while they're carrying a virtual beacon that mustn't be shaken too hard...
Odd: What about a looping? Ulrich/William/Yumi: ODD!!!
"Espionnage": The look on Odd or William's face while they babysit "zombie" Aelita is worth a chuckle.
"False Pretenses": Ulrich, Aelita, and Yumi are trapped in the forest because none of them know which one of them is the spectre, so Yumi decides to ask personal questions to figure it out. First she asks Aelita:
Yumi: Aelita, what do you call Jérémie when you two are alone? (the two look at Aelita) Aelita: Proxy-pie. (cue silence) Ulrich: Excuse me? Aelita: I said, Proxy-Pie. (cue Yumi, Ulrich, and everyone watching, especially Jerlita fans laughing their pants off)