In "The Time Capsule" the Thunderkittens say the same thing.
Wilykit: Safe is boring. Wilykat: I'll say it is.
Snarf's sarcastic remark in the first episode: "Snarf didn't to anything, of course. Just found the sword, that's all."
In "Unholy Alliance", the Mutants trying to keep Lion-O from saying "ThunderCats' hooooo!!!"
Ssslithe: The sword! Seize the sword! Monkian: That's what we're trying to do!
In "Slaves of Plun-darr", the whole chase scene with Monkian and the Thunderkittens, until Monkians ends up in a really big fall.
Jackalman: And you let them escape?! Monkian:(rubbing his behind) Well, they, uh... got lucky. That's all.
Lion-O being surrounded by the Brutemen he's freed.
Lion-O: You're not prisoners now. You can leave this dungeon. [The Brutemen come closer] Lion-O: No! NO! That way— the way out is over there!
After Ssslythe throw warp gas at them:
Lion-O Feel... strange. Angry. [the Brutemen start to gang up on him] Get out of my way! Let me out of here!
When Lion-O faces off agains't Tashi in the episode "The Doomgaze."
Lion-O: She's... so beautiful...
Snarf: Lion-O...
Lion-O: I-In a kind of evil way, of course.
While it's technicaly not apart of the actual show, the infamous blooper reel certainly qualifies.
It introduced us to the word, Samoflange!
I liked Slithe's own unique version of the "No * * Sherlock" line from the episode "Return of the Thundercubs".
Vultureman: We're up side-down!
Slithe: Thank you Sherlock Holmes!>:[
I'll be the first to admit I'm not a Captain Bragg fan but, that crow sidekick of his cracks me up just about everytime he talks. It's probably got a lot to do with the fact that I am a huge Groucho Marx fan!