Long-running animated series The Simpsons has been the source of so many iconic quotes that some of them have even come from characters who only appear in one episode. The story of the quintessential American family has been in the hands of some of television’s smartest minds for three decades, with every joke in every episode being meticulously crafted to get as big a laugh as possible. Sometimes, one-off characters can become famous because a well-known guest star is playing them. Other times, they’re funny enough to get by on their own merit. So, here are the 10 Most Memorable Quotes From One-Off Simpsons Characters.

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“Well, you all know what laughter sounds like.” – Rex Banner

In the episode “Homer vs. the Eighteenth Amendment,” orohibition is reinstated in Springfield, so Homer starts brewing his own beer under the name “the Beer Baron” and selling it to Moe. When Springfield police hit a snag in the search for the Beer Baron, they bring in tough-as-nails detective Rex Banner (played by guest star Dave Thomas) to take on the case. After he fails to catch the Beer Baron, Banner tells reporters, “I suspect he was just a figment of the media. The idea that someone like that could operate under my very nose is laughable.” Then, he struggles to laugh, fails, and simply says, “Well, you all know what laughter sounds like.”

“Tappa-tappa-tappa.” – Vicki Valentine

When Lisa was required to take an extracurricular physical activity, she started learning ballet under the tutelage of Vicki Valentine, a former child star. Lisa struggled to learn the moves, and whenever she got stuck, all her teacher could tell her was, “Tappa-tappa-tappa,” which Lisa found to be of no use at all.

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In the end, Professor Frink designs special shoes that allow Lisa to dance like a pro. “Last Tap Dance in Springfield” is not the greatest episode of The Simpsons, but Vicki’s incessant repetition of the phrase “Tappa-tappa-tappa,” in order to get Lisa to dance the way she wants her to, is unforgettably hysterical.

“Cats back for everyone!” – Lugash

Satirically derived from ex-U.S. gymnastics coach Béla Károlyi, Lugash is the Hungarian gymnastics instructor who taught Lisa in the episode “Little Girl in the Big Ten.” Apparently, he’s such a tough cookie that he defected back into Germany — not out of it, which is courageous enough — by cartwheeling over the Berlin Wall. At the end of the free one-time lesson that Lisa takes with Lugash at the YMCA, he congratulates his students on a good session by giving them their pet cats back. When one of them says she had a dog and not a cat, he simply tells her it’s a cat now.

“Do you find something comical about my appearance when I am driving my automobile?” – Ian

This character is commonly known as “Very Tall Man,” but according to The Simpsons Wiki, his name is Ian (so-called because he’s a caricature of the 6’8” Simpsons writer Ian Maxtone-Graham). He’s more than eight feet tall and, since he was bullied from a young age, he now spends his days going around town, teaching bullies a lesson. In the Short Cuts-inspired episode “22 Short Films About Springfield,” Nelson laughs at Ian while he’s driving his small car, provoking him into a confrontation. Then, Ian makes Nelson pull down his pants and march through the street, getting laughed at by everybody.

“‘Mono’ means ‘one,’ and ‘rail’ means ‘rail.’ And that concludes our intensive three-week course.” – Lyle Lanley

Lyle Lanley playing the piano and pointing at the audience in The Simpsons

Some fans have decreed “Marge vs. the Monorail” to be the best episode of the entire series, and considering that series is comprised of more than 600 episodes, that’s pretty impressive. The episode sees Lyle Lanley, a snake oil salesman, come to Springfield and pitch a monorail system to the town. Marge begins to uncover a conspiracy as she discovers several towns that Lanley fitted with a dodgy monorail system, then took off with the money. This two-sentence quote from the episode makes up the whole curriculum from Lanley’s three-week training course for the monorail’s potential drivers, which includes Homer.

“I’m an original creation, like Rickey Rouse and Monald Muck.” – Shary Bobbins

Shary Bobbins in The Simpsons

When the Simpsons hire Shary Bobbins — an obvious pastiche of Mary Poppins, as coyly pointed out in this copyright infringement suit-avoiding gag — to be their nanny, they don’t realize that for a magical nanny to fix all their problems, some of the work will have to come from them. They just want Shary to do everything herself, which results in Shary getting so frustrated and overworked that she quits before resolving their many issues and dysfunctions. Then, she hops on her flying umbrella and takes to the skies, where she is quickly sucked into a jet engine and killed.

“And now, the final ordeal: the Paddling of the Swollen A**, with paddles.” – Number One

When Homer is being inducted into a secret society, the Stonecutters, in the episode “Homer the Great,” he has to go through several rituals: “Crossing the Desert,” “the Unblinking Eye,” “the Wreck of the Hesperus,” and “the Paddling of the Swollen A**, with paddles.” They all involve walking through a group of guys and getting paddled on the behind.

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Years before Patrick Stewart would flex his comedic muscles on a more permanent basis with a recurring role as Avery Bullock in American Dad!, the Star Trek actor proved he had a funny bone as the one-time Simpsons character, Number One.

“I would die a happy man if I could prove to you that Homer Simpson has the intelligence of a six-year-old.” – Frank Grimes

Simpsons Frank GRimes

“Homer’s Enemy” is famously one of the darkest episodes of The Simpsons. It opens with Frank Grimes, a man who has been plagued by misfortune his whole life, getting a job at the nuclear power plant. There, he’s baffled to discover how inept Homer is. He doesn’t know a thing about nuclear physics, yet he’s in charge of the safety of a section of a nuclear power plant. Frank only gets more confused when he discovers that Homer has a wonderful home and a loving family, because he thinks that Homer is too stupid to deserve it. Frank eventually lets go and starts living like Homer, which kills him in an afternoon.

“Remember, I’m the sweet, perfect minister’s daughter and you’re just yellow trash.” – Jessica Lovejoy

Jessica Lovejoy in The Simpsons

Meryl Streep proved that she truly can blend into any role when she played Reverend Lovejoy’s rebellious daughter Jessica in The Simpsons and a lot of fans didn’t even realize it was her. Jessica steals donations from the church and blames it on Bart, reasoning that the townspeople won’t believe the truth coming from him, because he’s “yellow trash.”

Interestingly, the producers behind The Simpsons made the characters’ skin yellow to catch the attention of channel-hoppers long enough to get them hooked on the show. It’s crazy to think that The Simpsons was once mostly unknown and had to actively attract new viewers.

“Ever see a guy say goodbye to a shoe?” – Hank Scorpio

Hank Scorpio blasts his fire gun in The Simpsons.

Hank Scorpio, the supervillain who hired Homer to work for him in the episode “You Only Move Twice,” is perhaps the most renowned and beloved one-off Simpsons character in the show’s history. When he first visits Homer’s new house on his compound, he shows him his moccasins, telling Homer that if he likes them, he can have a pair, and if he doesn’t like them, then Hank won’t wear them anymore. He throws them out the front door and says, “Get the hell outta here!” He asks Homer, “Ever see a guy say goodbye to a shoe?” and Homer pricelessly replies, “Yes, once.”

NEXT: The Simpsons: 10 Times The Show Predicted The Future