"Sheesh. Forget a woman's birthday four or five times and you hear about it forever."
—Roger Fox, FoxTrot
Ever since you called me a 'freaky fish guy', I haven't been able to escape it! All over the world people see me and shout, "Hey, it's that freaky fish guy! Wanna throw a harpoon at us, Freaky Fish Guy?". And all because I ONCE threw a harpoon at somebody. Does that mean that I DESERVE being labelled a 'Freaky Fish Guy'!?...It's not like I make a habit out of it.
—Mako Tsunami, Yu Gi Oh The Abridged Series
"If a man builds a thousand bridges and sucks one dick, they don't call him a bridge-builder — they call him a cocksucker."
—Vince Boudreau, Play it to the Bone
Danny: And I always confuse Monet and Manet. Now which one married his mistress?
Danny: Right, and then Manet had syphilis.
Tess: They also painted occasionally.
Okay okay, geez, look, I kill a guy one time and now I'm never gonna live it down for the rest of my life, am I?
—Doctor Insano, The Spoony Experiment
I'd been a Serial Killer for four years, but they'd never given me a nickname. Then...you bite one guy on the arse, and suddenly you're The Buttmuncher.
—Frankie Boyle doing "Unlikely Lines in a Thriller Movie", Mock the Week
Ranma Arrives: Ranma arrives. Surprising, huh? "You're a pervert!" said Akane, inadvertently setting her fanfic characterisation for all time.
"Last time I was here, I said I was a (referring to his penis) "Magnum". Now people are always screaming 'Magnum' at me...I really shouldn't have said it."
— Gackt, a Japanese musician, retells a story he will never live down.
If Al Gore invented The Internet, I invented spell check.
—Dan Quayle, inventing Gore's invention of the internet
The reader also knows that everyone poos. But if the first thing a character does is poo in front of the reader, the reader will think of him as the Pooing Character forevermore.
Milhouse: Then let's just say, I don't care what people think of me anymore.
Bart: You mean up until now you did care? Then why did you wear that tutu to school last week?
Milhouse: What about all the times I didn't wear a tutu? Nobody ever brings those up!
Character: Says "I like bread" that one time.
Fandom: Character has an obsession with bread. Bread is character's true love. Draws character as bread. Every meta joke in fanfic is about bread. The character's room is wallpapered with bread.