He is a riot, though I wouldn’t quite call him a one-shot character, as the entire Waterfall family of one-shot appearances apiece is something of a running gag. Like this Waterfall appearance from The Problem with Popplers:
“We taught a lion to eat tofu!” (lion looks extremely unhealthy)
“You can’t own property, man!”
(Professor Farnsworth: ) “No, you can’t, because you’re a penniless, filthy hippie!”
“Don’t eat that! It’s an ape! Don’t kill one of nature’s beautiful creatures!”
(Zapp Brannigan: ) “You fool! You’d kill a beautiful woman to save a moderately attractive monkey?”
Leela: Didn’t you have ads in the 21st century?"
Fry: Well sure, but not in our dreams. Only on TV and radio, and in magazines, and movies, and at ball games… and on buses and milk cartons and t-shirts, and bananas and written on the sky. But not in dreams, no siree.
Amy: Fool me seven times, shame on you. Fool me eight or more times, shame on me.
Fry: It’s like a balloon and then… something bad happens!
Gotta love Lrrr (ruler of the planet Omicron Persei VIII!)
Ndnd: For the last time, I don’t like lilacs! Your first wife was the one who liked lilacs!
Lrrr: She also liked to shut up!
Lrrr: Why does Ross, the largest friend, simply not eat the other five?
Lrrr (After eating hippie): Whoa! My hands are huge! They can touch anything but themselves! (Touches hands together) Oh, wait…
And it’s a bit of a stretch to call it a quote, but in the Anthology of Interest where Bender becomes human, and in the course of a week eats himself up to 7 tons or so, and keeps making the “Whooo!” sound as they roll his corpse out of the Nobel prize ceremony always cracks me up.
Waterfall: “You shouldn’t eat things that feel pain.” (a thrown brick nails him in the face) “OWWW!”
Bender: (holding another brick) “Okay, we won’t eat you.”
One of the first episodes that I saw since Futurama moved to Comedy Central was The Deep South. One of the professors classic quotes was uttered without the silly censoring that plagued Cartoon Network - “Sweet Zombie Jesus”.
