The entire third-season episode "The Secret Society of Poobahs" is hilarious with all the increasingly silly and absurd customs of the Poobah society, but the definite highlight is the roll call (made even better by Jim Henson's brilliant performance as the Vanguard):
Beggler-Beg: The trial of Mokey Fraggle shall now begin! All Poobahs should be present! The judge will call the roll...
Vanguard: Allllll present shall reply by saying 'present,' And allllll absent shall reply by saying 'linoleum'! Fritz?
Vanguard: Ah, that Fritz, he's never here when you need him. And finally, Fritz, Fritz, Fritz, Fritz, Fritz and Fritz!
Fraggles: Present, Present, Present, Present, Present... present with an explanation!
Vanguard. Mmmmmmmm. (turns to the Beggler-Beg) All present and accounted fooooor... except for Fritz!
Beggler-Beg: Thank you, Fritz.
In the "Great Radish Famine," the Doozers take up knitting as a substitute for their construction work. Needless to say, they hated it.
In the same episode mentioned above, the Trash Heap optimistically fantasizes what the Fraggle/Doozer/Gorg meeting turned out to be. She imagines them singing a Tastes Like Diabetes song. Soon, the Trash Heap learns how the meeting truly went: cue cut to a disastrous, messy meeting.
One of Uncle Traveling Matt's postcards is about the time he decided to try out the rapid transit of the Silly Creatures- a roller coaster. His expression as the speed kicks up is utterly hilarious. His expression after he gets off is just as hilarious.
At the end of "Catch the Tail by the Tiger," Sprocket is no longer scared of the lightning. He has a rather demented look and is so excited that he wants to go out on another walk through the storm.
Sprocket's imitation of The Swedish Chef in "The Cavern of Lost Dreams".
For someone who changes his mind so easily, Wembley sure knows how to stick to his misunderstandings even when everything resembling logic or common sense scream that he's wrong. It reaches an absurd height in the episode "Scared Silly", where he, after an utterly failed prank war and due to a really silly misunderstanding, thinks that he and his friends have all blown up and gone to the Land Of Having Blown Up (It Makes Sense in Context... sort of). Even marveling at how similar the Land of Having Blown Up is to his own home, he refuses to consider the fact that maybe nobody's blown up because: "Gobo, listen to reason! We wouldn't be in the Land of Having Blown Up if we hadn't blown up, now would we?!"
In episode 17 ("Marooned"), while preparing Lima Bean Soup for Boober's birthday:
Mokey: It needs a bit more salt. Gobo: Sure, that's easy! (dumps a cup of salt in) Mokey: ...Now it needs a little less salt. Gobo: ...That's harder.
The 2013 "Ask a Fraggle" promo with Gobo and Red is traditional silly Muppet-interview-tomfoolery (and featured Gobo in his first speaking role for twenty years, now voiced byJohn Tartaglia), but the funniest bit is at the very end with the last question: