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In "Hare-Raising Night," Buster tricks everyone into going on a dangerous mission by saying they're going to the Emmys.
The entire "Mango Juice" segment of the "Kon Ducki" episode.
Heck pretty much all of "Kon Ducki", especially the "making of" part with the Running Gag of Plucky's name being misspelled on his chair ("Pluggy Doug" and later "Ploogy Doog"), showing how they did the "whirlpool scene" ("Go baby go!"), and the revelation that Sweetie is actually Richard Nixon.
In a scene from the episode "Animaniacs", we are given Gogo's... "unique" cartoon. It is so bizarre and unlike anything else in the series, that the audience (when shown watching the cartoon) have these hilarious facial expressions that just scream, Oh my God, what am I WATCHING???
There's also his explanation for it: "It was realism!" (For those who haven't seen it — it's actually an excerpt from a live-action, black-and-white Warner Bros. comedy short from 1953.)
Shirley the Loon's ending to her excruciatingly long cartoon. "Like, THE END ... fer sure."
In Starting From Scratch, when Buster tries to fight the bedbug with a homage to Bugs's Mexican hat dance. The animation combined with the music just sells it on a truly hilarious level.
Same episode, when Babs, Buster, and Plucky are inside Furball's head messing with his pleasure center and releasing his worst fears.
The Mynah Bird's cameos in Buster and the Wolverine. Especially when the characters land in a snowdrift after being spit out of the Wolverine's stomach and Plucky watches it walk off, saying "So that's what was jabbing me in the back!"
Also from Starting From Scratch, the heroes are shrunk on top of Furball, and Babs starts swinging around on one of Furball's hairs doing a Tarzan yell for no apparent reason. When she lands, Plucky just glares at her and says "That was pointless."
Fifi La Fume in the episode "Aroma Amore" has a few great lines, but the best has to be after she gives herself a makeover. She says to the camera "If looks could kill, you would not be feeling so well, eh?" Also her calling the fleeing Furball a flirt.
From thirteensomething, the two network executives Edward and Fran, who keeps telling him that he's "so lost". When Buster emerges on the show as Babs's "long lost twin" we get this:
Edward: This is great!
Fran: You are so lost.
Edward: No dear. YOU are lost!
(Fran gets hearts in her eyes)
Fran: Oh Edward! Kiss me! (She lunges at him)
Plucky: (To Babs after she hits one too many berserk buttons) I'm naming my first ulcer after you.
While it could double as a bit of Nightmare Fuel, Shirley getting angry in the "Amazing Three" segment of "Love Disconnection" drew some chuckles, in some part due to the short build-up by Babs.
The look of sheer terror frozen on Buster and Babs' faces when they realize Elmyra is their car rental agent.
Elmyra: Wait! Come back! I have so much love to give and SO MANY CARS TO RENT!
Shirley frequently referring to the two bunnies as "You murderers."
Hamton going prima donna after his epic swashbuckling story gets shot down for another Buster and Babs plot.
Hamton: It's PIG DISCRIMINATION, I tell you!
The reveal that the script was actually written by middle school students (And it was, too.).
Buster: What is with this story it's like thirteen year-olds wrote it!
Babs: Thirteen year-olds did write it.
Buster: Oh yeah, that explains it.
Buster on the airplane:
Plucky: (playing a flight attendant) And what'll it be? Gray lumps in brown sauce, or brown lumps in gray sauce? (Buster looks sick) Buster: Uh, you wouldn't have any tasy, nutritious carrots, perchance, would you? Plucky: Closest we come are these freeze-dried, reconstituted carrot chips. Buster: Hmm. How bad can they be? (tries one and instantly gets sick, melts, and bolts for the bathroom, which is occupied. He goes in anyway and afterwards...) Lemme guess: You guys had the carrot chips too?
A little exchange in the 'time travel' episode was probably stolen from classic vaudeville:
Buster: Take away your props and costumes and what would you be?