I always enjoyed the exchange in "Cement Heads" when the gangsters are attempting to exchange Ickis for the stolen toenails.
Gromble: No deals with hostage takers, Chimera. Ickis: Whaddaya mean no deals with hostage takers?! What's this world coming to?! If you can't deal with a hostage taker who can you deal with?!
Somewhat surprisingly, this actually causes the Gromble to relent.
"It's Just a Movie" in its entirety. Basically, Ickis goes to a theater and watches a cutesy kid's film about a fluffy Teddy bear named Cuddles. (An obvious parody of Care Bears.) Being a monster, and thus being afraid of cute, cuddly things, it ends up scaring him, and throughout the episode, Ickis is freaking out about Cuddles the Bear finding him. And then the real Cuddles actually just Zimbo in a suit appears and begins to chase Ickis around, threating to cuddle wuddle with him.
The scene where Ickis tries to frighten a nurse but she instantly forgets her fear and starts baby-talking and cuddling him upon seeing him seems to be one In-Universe; even the Gromble finds it so hilarious he can't stop rolling around on the floor laughing, despite how much a failed scare angers him.
The episode "Monsters Are Real" has Ickis photographed and needing the other monsters who help him by confiscating all newspapers with his photograph printed in them. Two monsters collect newspapers in one of those newspaper dispensers where you pay a nickel to get a paper. One of the monsters insists on paying for every individual newspaper. When told to just take all of the papers out at once, the monster replies that it wouldn't be the right thing to do.
The episode "Room Without a Viewfinder" has Ickis attempt to remove the Viewfinder so that the Gromble won't know that he has been slacking. The Viewfinder ends up coming to life and Hilarity Ensues. After recording the memories of a corrupt mayor, a cheating boyfriend, a Small Name, Big Ego chair salesman, and an old man, the monsters eventually return the Viewfinder. The episode reaches its funniest in the ending, where Ickis is put in the Viewfinder and the humans' memories are mixed up, resulting in such hilarious images as the mayor being made fun of by children for losing a game of musical chairs and the chair salesman's younger self betting on a horse race.