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.