In the personality profiling inventory known as the Enneagram, "Type 8" is a personality type characterized by high assertiveness, aggression, and independence. According to the Enneagram's theory, when harsh, abrasive Type 8s experience a positive shift in their mindframe (which may or may not be brought on by the actions of others), they take on the traits of Sweet tsunderes, characterized by kindness, open-heartedness, caring, and generosity.
Nerds candy. Sour on the outside, sugary-sweet on the inside!
Similarly, Sour Patch Kids. Even the TV commercials state that, "First they're sour, then they're sweet."
There was a tagline for a line of Life Savers called Kickerz that went like this:
The Troublemaker. He likes it sour. sun in your eye sour. monster wedgie sour. and Then, all of a sudden, he goes sweet on you. What gives?
Tsundere Cafes have been opening in the Otakuland of Akihabara. Similar to Meido Cafes, the waitresses there are young attractive women, each acting tsundere-ish towards their patrons: very rude and impatient at the beginning ("Here, sit." "Am I supposed to wait for you, or what?" "Have you decided on your order yet?!") but getting increasingly more apologetic and dere when they are about to leave ("I'm sorry I said all those things to you... you will come again, won't you?..."). Witness reports say that this change is irresistible. The waitresses apparently enjoy their jobs immensely, too, but, heck, getting paid for being rude to customers? A dream job.
This is sort of the gimmick of the American restaurant Ed Debevicks, where both male and female waitstaff are deliberately rude to customers.
Dick's Last Resort in San Diego does the same thing, among other things hanging the ties of patrons on the walls is part of the schtick and it's a highly recommended spot to go to not just for the food.
The restaurant Durgin Park (motto: "Established before you were born") in Boston is well known for their "sharp tongued" waitstaff, but they're more the "cranky aunty" types than regular Tsundere. It's well known in Boston just for the experience.
There is a restaurant on O'ahu called Ah-Lang. The owner/cook isn't called "Angry Korean Lady" for no reason at all - basically, every grumpy Asian mother or cranky Asian you've met on the street who snaps at you for trying to talk to them, rolled into one. It is, of course, an act, and she softens up if you bring her the right sort of beer.
From The Other Wiki: Toy manufacturer Tomy Co. has come up with the world's first "tsundere" portable television set, which gives audio guidance with a harsh voice that gradually becomes kinder as the user gets used to the set.
Anyone who has ever raised or spent a good amount of time around cats can attest to the prevalence of the Harsh personality in the species. Tsundere cats will get angry when you try to pet them, but leave them alone, and they'll come sulkily up to you for attention as if to say, "It's not because I want it. It's only because I feel sorry that you look so pathetic."
A storyline in Zits has Hector flirt with being a 'bad boy' but eventually resolves to stay a 'tootsiepop personality' — "hard on the outside, but with a soft, chewy center."
Filipino actress Maricel Soriano helped popularize the Tsundere archetype in The Eighties and The Nineties Filipino films and TV shows. Although the first tsundere was introduced in Japan before her shot to fame in the Philippines, several people didn't know it was the exact term for the archetype until around the 2000's.
Very common behaviour among children and young teens. No specific examples, please.
Fiat demonstrated this in an ad for the 500 Abarath. A man fantasizes that the car is a beautiful woman who slaps and chews him out for looking at her butt when she was bent over adjusting her shoes, then softens her tone and gets close, at which point the fantasy ends.
An article in The Escapist has noted that a scientific study has demonstrated that tsundere appeal may in fact be rooted in the way we unconsciously track our relationships with others.