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troperville

Zatch/Gash and Kiyomaro are chasing after a nun's partner a rabbit/monkey looking Mamodo boy, Momon by name. Kiyomaro encounters him by the river bed where he pants him. When the Zatch/Gash gather they go looking for him, or rather he finds them and lift Tio's skirt. Not only does he get to look at her undies once, but twice. When they capture him she breathes a sigh of relief that Kiyomaro and Zatch (who the former she has a crush on and latter may or may not) did not see them.
- Thanks to Momon, they do
The look on Demolt's face when he realizes that he's not looking at Gash, but Kanchome. When a guy like that starts sweat dropping, it's impossible not to laugh. Also a Crowning Moment of Awesome.
From the dub: Kiyo sees that the river is frozen in the episode where the Ice mamodo Reycom appears. Zatch remarks that the river is filled with 'fish popsicles'. The look on Kiyo's face when he screams "FISH POPSICLES???!!!" is priceless. In fact, a lot of facial expressions from both the anime and the manga are priceless.
Konjiki No Gash Bell: Take your pick. Folgore's "Chichi wo Moge"/"Hey Hey Let's Dance All Day" moments. Just about anything Victoream says ("Very melon!"). Actually, Folgore and Victoream together usually result in insane moments of hilarity, and it happens twice on the show, the latter being an entire episode where Folgore talks about a movie he is planning to make about Victoream.
The chapter/episode where Kiyomaro goes camping. Just... the whole thing...
- And later, the one where they all go ice skating... and everyone slips the moment they step on it. Bonus points for Sunbeam cursing and punching the ice (since he just finished a fight against Parumoon the ice horse momono.)
The simple fact that Papipurio made it to the top 10. The rest of the top 10 consists of the main villain+ henchmen, the protagonists and their worf friend, and then...Papi.
Bari's first encounter with Zatch.
- Danny's as well.
Somewhere between this trope and CMOA is the greatest demon head of all time, which Kiyo takes to astonishing levels when he returns from the dead and curbstomps Rodeux with little effort.
During the episode where Hibiki, a new transfer student is introduced, her cat which she brought to school pops out of her bag, the teacher tells her off for this and says she can't bring a cat to school. Her classmates are quick to jump to her defense, and one of them points out that "there are even those who bring children to class."
- One even mentioned he sometimes brings his wife over. Cue said wife peering in from the door entrance.