science

Kanchō

Kanchō is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Kanchō rather than just read about it. In short: Kanchō (カンチョー; pronounced [kaɲtɕoː]) is a prank performed by clasping the hands together in the shape of a finger gun and poking the anus of an unsuspecting person, often while exclaiming "Kan-cho!" It is a common prank in East Asian countries such as Japan. In Korea, it is called ttongchim (똥침; 똥針, pronounced [t͈oŋ.tɕʰim]), and in China, qiānnián shā (千年殺, "thousand-year" or "immortal kill").

Key takeaways

Kanchō belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Kanchō to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Kanchō from memory before moving on to harder problems.

Reference excerpt

Kanchō (カンチョー; pronounced [kaɲtɕoː]) is a prank performed by clasping the hands together in the shape of a finger gun and poking the anus of an unsuspecting person, often while exclaiming "Kan-cho!" It is a common prank in East Asian countries such as Japan. In Korea, it is called ttongchim (똥침; 똥針, pronounced [t͈oŋ.tɕʰim]), and in China, qiānnián shā (千年殺, "thousand-year" or "immortal kill"). The word "kanchō" is a slang adoption of the Japanese word for enema (浣腸, kanchō). In accordance with widespread practice, the word is generally written in katakana when used in its slang sense and in kanji when used for enemas in the medical sense. In English-speaking countries, the term "goosing" generally refers to a comparatively mild poke, prod, or pinch on or between the buttocks with the tips of the fingers and thumb, in imitation of a harmless bite on the butt from a goose. This does not typically involve direct contact with or penetration of the anus. However, the kanchō prank may also be informally known as "goosing" in some contexts. Unlike traditional goosing, kanchō involves directly targeting the anus, which means that performing it without consent in jurisdictions such as the United States could constitute assault, battery, or sexual assault/battery, depending on factors such as the victim's age, the circumstances, intent, and local laws. This may lead to criminal charges, fines, school discipline, or other consequences.

Popular culture Kanchō is present in the form of the "One Thousand Years of Death" technique in the Shōnen Jump series Naruto, along with its anime adaptation of the same name.

See also Boong-Ga Boong-Ga – video game which allows the player to engage in simulated kanchō Pantsing

Notes

References

Illustrations

Worked examples

Example 1 — a first encounter with Kanchō

Start with the simplest possible case. Write down what Kanchō claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Kanchō before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Kanchō ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Kanchō

In research: Kanchō appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Kanchō in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Kanchō is common in secondary-school and first-year university syllabi. It links to neighbouring topics Anus, Harassment and bullying, Practical jokes, so understanding it makes those chapters shorter.
In everyday life: Look for Kanchō outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Kanchō in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Kanchō means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Kanchō out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Kanchō in simple terms?

Why does Kanchō matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Kanchō?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Kanchō.