These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Brak: Maybe he did, or maybe I'm just CRAZY! AHHHHHHHH! AHHHHHHHHH! Come forth, my precious! (voice suddenly goes deep)TIME TO DIE!
Clarence:(runs away screaming)
Zorak fails to get his booth back from Butchy, resulting in two Curb Stomp Battles, and takes up forceful residence in Brak's room. Fed up with Zorak's refusal to leave, Mom goes out to set Butchy straight. And, boy, does she whoop Butchy's ass. (Although due to the limited animation, the actual fight is obscured, technically making this an Offscreen Moment of Awesome.)
Seeing Thundercleese return to full power to destroy the meteor threatening the planet is pretty awesome in itself. Even better, he ensures his abilities are back by blasting Zorak to smithereens, after spending the episode dealing with Zorak taking advantage of his deactivation to wreck his stuff.
Big Lipped Alligator Moment: A common occurrence in the show, due to the style of random humor employed in the series. Such moments include a tiny robot appearing out of nowhere to mimic Brak, the underground chamber containing Roblox-esque automatons of the family, and a small alien popping out of thin air to kick Thundercleese's head before running away.
Ear Worm: Some of Brak's impromptu songs can be quite catchy.
There's also the Gainax Ending of "Expiration Day", where a "liver replication" plot has apparently gone underway, transforming the cast into giant livers. Even worse, they're Laughing Mad right through the credits.
This series features a few freaky eyed entities, such as the giant floating eye that appears to challenge Dad to a staring contest, and Rhonda, OF THE SEVENTH LEVEL OF YAR, whose only visible features are deranged eyes.
Not to mention the segments' threatening message of "We will kill you."
The Scrappy: Clarence. He was a replacement for Sisto in Season 2, and spent most of his time being annoying and taking up large chunks of the plot doing nothing. However, he did get better in the Grand Finale.